The Lapytans are inhabitants of a floating island who wear mathematical and astronomical symbols. Their heads are slanted to the left or right, and their clothes have pictures of either musical instruments or astronomical signs. They have terribly short attention spans, so they carry around "Flappers." These are use for hitting other people during conversation in order to keep them focused.

The men are obsessed with mathematics. They never hav peace of mind and constantly worry about dangers such as the possibility that the sun might go out. The women are very sexual creatures who often cheat on their husbands, especially with their preferred men from Balnibarbi, but the men are so wrapped up in mathematic that they do not notice.