This is a Mercator projection world map where you can click to recentre the projection about any point. More details in a blog post here (general background in full post).
Live version hosted here.
Putting this old version up so I can reference it
An experiment with using pygame to simulate a physical system, inspired by Peter Collingridges's tutorial posts. In this case, I'm modelling resonances on a string fixed at one end, with the other end driven at a variable frequency. Full description in blog post here.