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The lithograph Waterfall, written by Dutch artist Escher in 1961, whose design is based on the impossible triangle of Roger Penrose. Such a triangle consists of three boards (crossbars), each of which is laid at right angles to the other.
Actually the waterfall itself in the picture is as follows: the water falling from the very top tower spins a wheel, which then directs the same water to the top of the structure. In general, the operation of such a mechanism is impossible according to the law of conservation of energy, more precisely, even if the wheel is started by water, then after a while the mechanism will inevitably stop. Simply put, the operation of such a waterfall, as a perpetual motion machine, is impossible.
The path along which water rises is quite unusual. The columns located at the corners of the groove, in fact, do not rise upward, as it seems at first, but abut against the track, forming several more Penrose triangles. Even the upper turrets are not located at the same level, but with a difference of at least half a floor. In general, water, if you forget about the columns and the waterfall itself, clearly flows along the plane or even with a downward slope. But, somehow, in the picture after completing the cycle, it appears above the wheel and the pool, from which it leaked into the distance. All elements of the picture are drawn without perspective, which allows you to achieve interesting optical illusions and impossible figures.
The waterfall in the picture is a structure that is located next to houses and unusual plants. Everything around him looks quite normal, and a woman standing on the roof of the house on the right, calmly hangs out to dry her clothes.
Escher created more than one paradoxical drawing, and many of his works make a person get lost when trying to imagine the objects of his paintings in reality.