Waterfall
lithograph, 1961, 38 x 30 cm

It is composed of square beams which rest upon each other at right-angles. If we follow the various parts of this construction one by one we are unable to discover any mistake in it. Yet it is an impossible whole because changes suddenly occur in the interpretation of distance between our eye and the object.
This is impossible triangle is fitted three times over into the picture. Falling water keeps a millwheel in motion and subsequently flows along a sloping channel between two towers, zigzagging down to the point where the waterfall begins again. The miller simply needs to add a bucketful of water from time to time, in roder to compensate for the loss through evaporation. The two towers are the some height and yet the one on the right is a story lower than the one on the left.