![](https://freight.cargo.site/t/original/i/99b5f5e19cbbb1f43def90aa7a2325fb30ff34a4f6d11ddd24a55a45cb08dda4/Glass_marbles_sml_crop.jpg)
Panes of transparent glass intersect and overlap. Starting anywhere, you can interpret what you see as part of a three dimensional object, but whose orientation is unclear. As your eyes continue along a path, you will find edges that force the panes to take a specific orientation. But if you try to extrapolate, you find contradictions: panes that looked horizontal now seem to be vertical, or vice versa. On a larger scale, it is impossible to perceive this scene as a definite physical object that can live in three dimensions.