a radiometric investigation for various angles of two dry craniums and of the encephalographic or cerebral arteriographic pictures of 250 subjects has revealed the following facts : the architectural lines of the dome of the skull found by orthogonal projection of the profile , from the front , and in vertical projection , are hyperbolic spirals starting from the base of the skull and converging on the sphenoid .
C0037303
skull
C0037884
sphenoid