Explanation thumb|A possible non-cube object that, viewed from appropriate angle, looks like an impossible cube. thumb|Impossible cube with forced perspective in Rotterdam, by Koos Verhoeff The impossible cube draws upon the ambiguity present in a Necker cube illustration, in which a cube is drawn with its edges as line segments, and can be interpreted as being in either of two different three-dimensional orientations.
Explanation thumb|A possible non-cube object that, viewed from. appropriate a?n.gle, looks like an impossible cube. thumb|Impossible cube with forced perspective in Rotterdam, by Koos Verhoeff The impossible cube draws u.pon the ambiguity present in a Necker cube illustration, in which a cube is drawn with its edges as line segments, and can be interpreted as being in either of two different three-dimensional orientations.