Which Way It Faces
A wire cube that cannot make up its mind which of its faces is at the front.
这个体验还没有翻译，所以文字仍是英文。
玩法
先看，再回答
A wire cube that cannot make up its mind which of its faces is at the front.
- 不到一分钟 · 1 个问题 · 然后是解释
原理 — 建议试过之后再读
Two cubes in one drawing
Twelve lines fit two different cubes equally well, one seen from above with the lower-left face in front, one seen from below with the upper-right face in front. With nothing to choose between them, perception settles on one, tires of it, and flips to the other.
The Swiss crystallographer Louis Albert Necker noticed the flip in 1832 while drawing crystals. You can steer it a little: look at one corner and imagine it nearer, and the cube tends to rearrange itself around that choice.