Month: April 2014

Inverted Earth with the same volume of oceans

Everyone knows about the inverted Earth where seas become land and land becomes seas, but that’s quite boring. Last April there was an interesting question posted at the Finnish Wikipedia’s “ask anything” discussion page. Just like the basic inverted Earth,

Tagged with: , , ,

Perspective rectification

This is a cool perspective rectification method that I learnt last week. It probably has also a lot of other useful applications in addition to this one. Figure 1. When cataloging uncommon books at LibraryThing, one can often notice that

Tagged with: , , ,