Borromean rings
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In mathematics, the Borromean rings are three simple closed curves in three-dimensional space that are topologically linked and cannot be separated from each other, but that break apart into two unkno
A monkey's fist knot
Impossible object
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An impossible object is a type of optical illusion that consists of a two-dimensional figure which is instantly and naturally understood as representing a projection of a three-dimensional object but
Borromean rings
…rings are typically drawn with their rings projecting to circles in the plane of the drawing, but three-dimensional circular Borromean rings are an impossible object: it is not possible to form the Borromean rings from circles in three-dimensional space. More generally Michael H. Freedman and Richard Skora (1987…
A 3D-printed version of the Reutersvärd Triangle illusion, its appearance created by a forced perspective
As the viewing angle changes of this sculpture in East Perth, Australia, a Penrose triangle appears to form.