In Hungary, winters can be long (so I’m assuming). Before television, intelligent Hungarians tried many different pastimes to make it through those dark days. One of these, János Bolyai, resorted to non-Euclidean geometry.
Bolyai wasn’t warning his son off gambling, or poetry, or a poorly chosen love affair. He was trying to keep him away from non-Euclidean geometry.
I myself tend to contemplate the Cantor Set, but that’s just me. This looks like a tempting book, though.