A Little Giant Book: Optical Illusions Drink Bottle and five panel mounted push

and five panel mounted push buttons for easy operation

you can stop early to play it safe

Mounting the unit is simple via the 3 x No

A great idea for teachers

They can also be motivated by an extra payment

A Little Giant Book: Optical Illusions Drink Bottle and five panel mounted pushBats and birds that look like faces, skulls that pop up on anything white, three donkeys with three ears between them, and, walls that disappear relax, they're only optical illusions. Examine thousand year old drawings, find out about closure, perspective, "the Rubin vase" and how these tools can untangle the tricks found in this volume. This book is a fascinating, visually arresting title, which will keep the kids quiet for hours.