Geometric ModelsMaybe it was the Summer of Love?  Things of Science started to get more colorful in 1969 — swapping out the usual yellow-gold paper for other colors (although admittedly, a less-than-inspired gray here) .

Additionally the “logo” for Things of Science changed as well. See for yourself on page 1 of the booklet linked below.

This unit takes on geometry but explains some familiar concepts in a hands-on way. Very cool.

Here is the booklet:

Things of Science (1969) — Geometric Models

The last few pages of the booklet contain scans of the cards that came with this unit. Additionally there was string, a push-pin, etc. Contents here:

Geometric Models Box

More Things of Science scanned here.