referring to fig1 - 3 , an interconnectable play object is shown as a plastic cube with a connector 12 on three of its six faces . in this view the three connectors 12 are on a top face , a bottom face , and one of the four side faces . alternatively , connector 12 can be placed on a top face and two side faces that can be either opposite or adjacent . in each case the connector - bearing faces of play object 10 are mutually non - parallel and orthogonal . instead of being cubic , object 10 can have another multi - faceted parallelepiped or polyhedral shape , arranged to have maximum symmetry , little symmetry or no symmetry . in other embodiments the object may have curved faces , e . g ., a cylinder , a sphere , an ovoid , a paraboloid , a cone , a surface of revolution , a section of one of the foregoing , or some other arbitrary shape . in some cases the objects may have a shape representing one of a class of objects . for example , for constructing a miniature building the objects may be shaped to represent a window , door , chimney , roof , gable , etc . in another example , the objects may represent human or non - human anatomical components such as an arm , leg , head , torso , hand , paw , tail , hair , eyes , ears , etc . the latter example may also include clothing and accessories such as shirts , skirts , dresses , pants , hats , shoes , handbag , suitcase , etc . for practical embodiments at least two faces of the object will bear a connector and the other faces will not . in particular , most embodiments will have at most three of the faces bearing a connector . the connectorless faces will present a fibrous material or other material that can be penetrated by spiral prongs n and n ′ of connector 12 . such penetrable material of the connectorless faces may be a knitted or woven fabric , a felt layer , a pile or carpet - like layer , or other fibrous material . in other cases the object itself may be made of a penetrable material such as a sponge - like substance , clay , polystyrene foam , a soft plastic , an elastomer , etc . in still other embodiments the object may have an external mesh or grid with sufficient underlying clearance to accept prongs n and n ′. for example , the object can be an open frame covered with plastic screening much like the screening used in windows and doors . it will be appreciated that such penetrable material may appear only on connectorless faces , or may appear on every face but will be overlaid with a connector 12 on some faces . connector 12 has a central first hub 16 encircled by an annular , second hub 14 . annular hub 14 may have essentially cylindrical inside and outside circumferences , while hub 16 may be essentially a cylinder with a circular outline . alternatively , the interfacing surfaces of hubs 14 and 16 may be joined by an annular bead that snaps into an annular groove . hubs 14 and 16 may be made from plastic , metal , ceramic , wood , or other materials . hub 14 has a pair of radially aligned steps that descend onto opposite ends of recess 14 a . hub 16 has a wedge - shaped recess 16 a having approximately the same angular compass as recess 14 a . recesses 14 a and 16 a provide clearance for manually operable link 20 , shown as a flat blade with straight edges , a rounded proximal end , and a distal end with transverse tab 20 a . link 20 is pivotally connected at its proximal end to hub 16 near the inside corner of recess 16 a . link 20 is also pivotally connected to hub 14 at the center of recess 14 a . link 20 extends to the outside of hub 14 and by manipulating its distal tab 20 a can act as a manually operable lever . using hub 16 as a frame of reference , if link 20 is rotated clockwise ( counterclockwise ) hub 14 will rotate clockwise ( counterclockwise ). in most embodiments hubs 14 and 16 will both counter - rotate concentrically and relative to object 10 . accordingly , axle 22 extends along the axis of hub 16 and ends in a ball 22 a that will snap into a socket ( not shown ) in object 10 to allow rotation of hub 16 relative to object 10 . hubs 14 and 16 have a plurality of spiral prongs n and n ′, respectively . prongs n are arranged in two circular concentric rows of twenty prongs each , that is , forty altogether on hub 14 . prongs n ′ are arranged in two circular concentric rows of twelve prongs each , that is , twenty - four altogether on hub 16 . prongs n ′ are shaped and distributed in the same way , except for being a mirror image of the arrangement of prongs n . referring to fig5 and 6 , prongs n are shown arranged into concentric circular rows identified as an outside row r 1 and an inside row r 2 . a portion of the outside row is illustrated by itself in fig6 . each prong n has a portion na embedded in hub 14 to support an exposed portion nb having an overall exposed length s 1 . portion na may be embedded by being molded in place . while distinct embedded prongs are illustrated , in some embodiments the prong will be a feature molded upon the face of the hub . in this embodiment prongs n have a circular cross - section and their distal tips may be sharpened by being ground at an angle to produce an elliptical feature nc . however , different cross - sections are contemplated and sharpening is optional . in fact , to protect children from injury , the distal tips may be rounded to eliminate any sharp edges . embedded prong portion na is straight and lies in an upright reference plane that is parallel to the axis of hub 14 and tangent to the circle defining the prong row ( in fig6 row r 1 ). this point of tangency is defined at the transition between portion na and portion nb . both portions na and nb lie in a canted plane c that is perpendicular to the reference plane . this canted plane c intersects the axis and the surface of hub 14 at angle v , which defines the angle of elevation of prong n . the exposed portion nb of prong n is shown curved in fig5 , which is a plan view and therefore essentially a projection of prongs n onto the surface of hub 14 . prongs n are shown there following circular paths associated with their respective rows r 1 and r 2 ; although strictly speaking , to project onto a circle , prong portion nb would follow an elliptical path in canted plane c . while exposed portion nb can follow such an elliptical path to project the ideal circular path , as a practical matter there is almost no significant difference between bending the portion nb into this elliptical path or approximating the elliptical path with a circular bend . this follows from the fact that prong portion nb follows a relatively small turning arc u of about 15 °. in particular , since there are twenty prongs n per row , the prong to prong spacing is 18 °. ideally , the exposed portions of the prongs will follow a helical path and therefore will not lie on a plane . fig7 shows a prong n 1 whose exposed portion follows such a helical path . a line tangent to such a path can be set to have the same angle of elevation v as before , but , being helical , the path will rise faster and reach a greater height s 3 for the same turning arc . referring again to fig6 , prongs n should be thin enough and long enough to pierce and efficiently anchor to the target material . if the prongs are too thin they will tend to bend or break and will not effectively penetrate the target material and stay anchored thereto . also , if the prongs are too long , they may require rotation through a greater angle , which will tend to slow the speed of penetration and increase the torque needed to penetrate . in addition , the angle of elevation v of prongs n should be steep enough to ensure that the prongs penetrate to a sufficient depth without skimming over the surface of the target material . on the other hand , an excessively steep angle of penetration will provide insufficient anchoring strength and the prongs will tend to slip out of the target material . if play objects 10 are relatively large ( say 25 cm or more ) the faces with penetrable or fibrous material can be made with a covering of pile loop carpeting . if play objects 10 are of a modest size ( around 10 cm ) these faces can be covered with felt ( about 6 mm thick , for example ) or with a relatively thick fabric such as burlap . for relatively small play objects ( say 5 cm or less ) these faces can be covered with one or two layers of a relatively thin fabric such as linen . in some embodiments the penetrable material may be the loop fabric used in conventional hook and loop fasteners . for prongs intended to anchor onto loop pile carpeting ( e . g ., carpet pile 3 mm deep with 4 mm loop circumference ) an exposed prong length s 1 of 0 . 25 to 0 . 35 inch ( 6 . 4 to 8 . 9 mm ) at an angle of elevation of 30 °± 10 ° works satisfactorily . for the embodiment of fig6 prong n will have a nominal rise s 2 of 0 . 15 inch ( 3 . 8 mm ). for the embodiment of fig7 rise s 3 will be nominally 0 . 19 inch ( 4 . 8 mm ). for effective anchoring , the exposed length s 1 will exceed the rise ( rise s 2 in fig6 and rise s 3 in fig7 ). in one embodiment prongs n were made of steel piano wire , 0 . 033 inch ( 0 . 84 mm ) in diameter . however , to reduce the risk of injury , prongs n and n ′ may be made of a plastic fiber that is stiff enough to penetrate the material of the opposing face . it will be understood that the foregoing dimensions and materials can be varied depending upon the target material , desired anchoring strength , desired angle of rotation , strength of the prongs , etc . for penetrable material thinner than ordinary pile loop carpeting , prongs n and n ′ will typically be scaled down in proportion to the reduced thickness of the penetrable material . in general , the length , number , spacing , angle of elevation and other characteristics of prongs n and n ′ may be altered to accommodate different penetratable materials . also , if the prong - bearing hub will have a greater diameter , the number of prongs per row can be scaled up appropriately while keeping approximately the same prong length . so if , for example , the hub diameter is doubled in comparison to the foregoing embodiment , the number of prongs will be doubled as well for the same prong length . referring to fig4 , the previously described play object 10 is shown built using twenty identical objects 10 to create a structure greater than any one object 10 ( i . e . greater in height , width , or depth ). in column c 1 three blocks 10 are stacked squarely with their undersides having connectors 10 ( only their tabs 20 a being visible for the lower two ). objects 10 of column c 1 also have connector 12 on the back ( not visible ) and on the front . column c 1 is placed on a substrate made of material similar to the previously mentioned penetrable material of the connectorless faces of object 10 . the lowest object 10 of column c 1 is positioned as shown on substrate 24 and then tab 20 a is pushed back to counter - rotate its hubs ( hubs 14 and 16 of fig1 - 3 ). essentially , each of the connector hubs ( hubs 14 and 16 of fig2 ) will rotate relative to its object 10 so that the object does not angularly shift by being fastened in place . consequently , prongs n and n ′ ( fig3 ) counter - rotate with hubs 14 and 16 , respectively . being helical , or approximately helical , prongs n and n ′ screw and anchor into the penetrable material on the connectorless face of object 10 . in this embodiment hubs 14 and 16 rotate 15 ° or less , i . e . no more than the angle u of fig5 . here the angle of rotation is no more than one - twenty fourth of a turn . to make an anchor quick - acting it is advantageous to have the angle of rotation at most one - sixteenth of a turn . it will be appreciated that the relative rotation between hubs 14 and 16 will be additive , that is , 30 ° or less . however as a practical matter , the relative rotation need not reach its full potential angular displacement to achieve satisfactory anchoring . in any event , prongs n and n ′ of the two hubs spiral into substrate 24 of fig4 and lock in place . the middle object 10 of column c 1 is placed atop the lowest object as shown . as before tab 20 a of middle object 10 is pushed back to allow the underlying prongs n and n ′ ( not shown ) to spiral into the penetrable material atop the lowest block 10 . this process is repeated for the top object 10 . in this specification an interconnecting or prominent face of an object is defined as one that ( a ) connects to a connector on an adjacent object , or ( b ) bears a connector that connects to either substrate 24 or a connectorless face of an adjacent object . a cylindrical object 110 is placed at the top of column c 1 . object 110 has on its circular top and bottom a connector 112 designed the same as connector 12 . connectors 112 have link levers 120 extending radially . the bottom connector of object 110 connects to the connectorless top of underlying object 10 in the manner just described for objects 10 . a bridge b may be formed with the two objects 10 . the left object 10 of bridge b has a connector 12 to the right and left ( not shown ) in order to connect to the adjacent objects 10 in the manner previously described . the right object 10 of bridge b has a right connector 12 ( not shown ) that is connected to the connectorless face of adjacent object 10 before or after the erection of column c 2 , which is built and arranged the same as column c 1 but with two additional objects 10 . two objects 210 are connected to the top of the column c 2 . objects 210 are twice as long as objects 10 but have the same height and depth . objects 210 each have a pair of connectors 212 on top and a pair of connectors 212 on the bottom . connectors 212 are identical to connectors 12 . for each of the objects 210 a connector 212 is mounted on only one of the small faces . the lower one of the objects 210 has only one of its two bottom connectors 212 connected to the top of the top object 10 of column c 2 . in this arrangement lower object 210 projects diagonally back and to the left from the top object 10 of column c 2 . in comparison to lower object 210 , upper object 210 is rotated along its longitudinal axis 90 ° so one of its long connectorless faces can connect to a distal one of the connectors 212 atop the lower one of the objects 210 . the longitudinal axis of the two objects 210 are displaced azimuthally 135 °. column c 3 has five objects 10 arranged and interconnected the same as column c 2 . with this arrangement columns c 2 and c 3 are unconnected . these two columns can be connected and reinforced by rotating one or more of the bottom four objects 10 in column c 3 by 90 ° about a vertical axis to make some connectors 12 of column c 3 face column c 2 . branch 26 is supported by the right connectorless face of the top object 10 of column c 3 . branch 26 has four objects 10 with connectors 12 on top and bottom and to the left . the left connectors on objects 10 connect on the left to the adjacent object 10 . it will be appreciated that the position of connectors 12 can be finely adjusted since they may be positioned anywhere on the connectorless face of object 10 . taking advantage of this fact , objects 10 of branch 26 do not connect squarely but are offset diagonally to give the branch an upward and backward slant . in this embodiment the offset is even , but in other embodiments the offset can vary and may have an angular offset to lay a branch along an arbitrary three - dimensional path . another construction object 310 has an arched shape with a connector 310 atop the arch and two connector 310 ( not shown ) at the two feet of the arch . connectors 310 are identical to connectors 10 . referring to fig8 , substrate 30 may be made in a manner similar to substrate 24 of fig4 . in this embodiment a playset has a number of panels shaped to represent portions of a doll , two such portions 32 and 34 being illustrated here . specifically , piece 32 is a plastic panel having the outline of a doll &# 39 ; s head and imprinted with facial features and hair features . in order to connect to substrate 30 piece 32 has on its back a connector identical to connector 12 of fig1 , with its link lever 20 being partially visible in this view . piece 34 is a plastic panel with an outline of an upper torso and arms and imprinted to show a shirt . again piece 34 has a rear connector 12 ( only lever 20 visible ) to connect to substrate 30 . pieces 32 and 34 are part of a larger playset including multiple heads , torsos , legs , feet , hands , etc . a player can mix and match these components to custom design a figure . some sets will segment the head into a hair and face panel . also the body components can be varied with different garb and different body poses . when disassembling the structure of fig4 , connectors 12 may be released by pushing lever 20 in the opposite direction ( clockwise in fig2 ) to rotate hub 14 clockwise relative to hub 16 . consequently , prongs n and n ′ will unscrew and object 10 may then be reused in different positions in different structures . obviously , many modifications and variations of the present invention are possible in light of the above teachings . it is therefore to be understood that within the scope of the appended claims , the invention may be practiced otherwise than as specifically described .
a toy construction set has interconnectable objects , each with multiple faces . some faces have a connector , while others lack a connector but may have a fibrous or pierceable material . the connector includes a pair of concentrically nested hubs . the two hubs have spiral prongs that spiral in opposite directions . a manually operable link connected between the two hubs can relatively rotate them in opposite directions . the play activity proceeds by adjoining a pair of the objects with a prominent , connector - bearing face of one of the pair touching a prominent connector - free face of the other one of the pair . the player will counter - rotate the hubs in the connector of the prominent connector - bearing face to embed their spiral prongs in the fibrous or pierceable material of the prominent connector - free face .