Passage to Abstraction

Material A fame with a support that allows it to stand.There are 4 wires across, each with 10 beads.Green beads...

Material Seven wooden solids representing the following hierarchical values:1: a green cube of 1/2 cm x 1/2 cm x 1/2...

Material A large bead frame similar to the small bead frame, but with seven horizontal wires representing categories up to...

Material Seven racks, each containing ten test-tubes. Three racks are painted white for the simple family:One with green beads for...