Hang an equal number of colorful bananas on each hand of the monkey. If the numbers are equal and the sum is correct, the monkey will look straight ahead and its arms will be horizontal. If the numbers don't match, his eyes will look down and up and his arms will go up and down. That means it's time to try again!
1 scale (dim. 21.5 x 29 x 8.5 cm)
15 banana numbers