We are used to thinking that the Cartesian system is the best coordinate system, for be the most “natural”. But this is not always so. In this example, if we want to see lines through the mirror, we will have to draw curves on paper. Try drawing lines, circles, triangles and rectangles to be seen as such. through the mirror. And if you enjoy a challenge, how would you generate an image to put on paper, at the bottom of the cylinder, of so that it appears “corrected” through the mirror?

Many artists are dedicated to anamorphic art, both with mirrored cylinders and with other distortion and perspective features.

From the image below, you can see that, looking at the piece from the front, it is very difficult to see what it represents, but it's when looking at its reflection in the cylinder that the magic happens!