March 2019
Intermediate to advanced
208 pages
5h 11m
English
You may have seen pictures like this:

It’s a drawing of a still life in front of a picture frame. In the picture frame is the still life with a picture frame, which shows the still life with a picture frame, and so on. The image is defined in terms of itself: a drawing of a drawing of a drawing. How far does that sequence go on? In theory, it goes on infinitely. In practice, as soon as the image becomes too small to resolve, the artist stops drawing the smaller images and says, “Okay, that’s it.”
When dealing with images, this is little more than a clever visual trick. In mathematics and computing, there are many algorithms ...
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