In the fairy tale at the left, bistable situations can occur at oblique angles. You can test this using the bottom slider.
Source. I constructed this movie from the picture “a-j-a.gif” which I found “somewhere on the Internet”. It is also known as “(after) 6 beers”. Could anyone enlighten me about the original source? [It’s not from the “Invisible Monsters” cover, I had this image before that book came out.]
The painter Rex Whistler created a similar design “Cinderella and her fairy godmother”.