(1 customer rating) ★★★★★
A collection of self-working tricks based on a simple mathematical principle with multi-colored chips.
You will need to make the 5 chips yourself. Each chip has a color on the front and back. These chips can be easily made with stickers or permanent makers.
1st edition 1975, PDF 11 pages.word count: 2233 which is equivalent to 8 standard pages of text