Reversible figure - Hantenzukei (English spelling)

Japanese: 反転図形 - はんてんずけい（英語表記）reversible figure

This refers to a figure that appears in two different ways, alternating between the same figure. A type of ambiguous figure. A figure in which a certain area appears as both the figure and the ground is called a figure-ground reversible figure, and EJ Rubin's cup and profile figure is one example. A plane figure in which the sense of perspective is reversed is called a perspective reversible figure, and the Necker cube is one example.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

同一図形でありながら2種の見え方が交代して現れる図形をさす。多義図形の一種。図形の一定の領域が図に見えたり地に見えたりするような図形を特に図地反転図形と呼び，E.J.ルビンの盃と横顔の図形はその一例である。遠近感が反転するような平面図形を特に遠近性反転図形と呼び，ネッカーの立方体はその一例である。

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