Type of graphical projection which represents three-dimensional objects in two dimensions such that the three coordinate axes appear equally foreshortened
type of graphical projection which represents three-dimensional objects in two dimensions such that the three coordinate axes appear equally foreshortened (en)
The Penrose stairs depicts a staircase which seems to ascend or descend yet forms a continuous loop. (en)
In this drawing, the blue sphere is two units higher than the red one. However, this difference in elevation is not apparent if one covers the right half of the picture. (en)