Colorforms were invented in 1951
as an adult's toy. They consisted of five pages of vinyl geometrical shapes
...plus a few other bits, all in primary colors
. There were four plastic
-covered blank pages (also in primary colors) to stick them on. Still available in some art stores and museum
shops for substantially more than the kids' version.
Funny, how adults now play with kids' toys and don't have that many of their own anymore.