Stability control

A visitor stands on one leg at about arm's length from the table and is trying to keep the balance while looking at stripes.
The picture frame freely suspended at two points with the motif of vertical black and white stripes. By pushing to the edge of the table picture 5 - 10 cm is rocked back and forth. 
Dimensions (cm): 70 x 90 x 10
21IQ-0024