Thingmaker
Thingmaker, also called Creepy Crawlers, is an activity toy made by Mattel, beginning in 1964. The toy consists of a series of die-cast metal moulds resembling various bug-like creatures, into which is poured a liquid chemical substance called "Plasti-Goop", which comes in assorted colours. The mould is then heated to about in an open-face electric hot plate oven. The Plasti-Goop is cured by the heat, and when cooled forms semi-solid, rubbery replicas which can be removed from the mould. The concept of the Thingmaker was introduced in 1963, as part of Mattel's Vac-U-Maker set. This omnibus toy combined the new moulds and Plasti-Goop technology with the existing Vac-U-Form machine, a vacuum forming toy, which molded simple sculptures by heating thin sheets of plastic, then using a vacuum pump to form the softened plastic over hard plastic forms. Following this introduction period, the Thingmaker portion was spun off as a separate set, and launched as the "Creepy Crawlers" line. Mattel packaged moulds from various sets to be sold separately, and also combined moulds into larger omnibus editions, encompassing several themes into one set, under names such as "Triple Thingmaker", "Super Thingmaker" and "Every Thingmaker". Mattel marketed numerous Thingmaker sets as follow-ups