Impossible figures with other illusions
One of the most known kind of illusions is subjective contours illusion and the most recognizable example is Kanizsa triangle. These spatially separate fragments give the impression a bright white triangle, defined by a sharp illusory contour, occluding three black circles and a black-outlined triangle.
Christopher Tyler improved this illusion combined it with impossible triangle. His 3D figure is simultaneously both illusory and impossible.
Impossible Illusory Triangle
The image was found at http://illusionoftheyear.com/2011/impossible-illusory-triangle/