Left: The large rectangle is plastic and can be split into a square (blue) and two plastic rectangles (red and {green).
Centre: The two arcs drawn in each square.
Right: A Harriss spiral.
Image: Chalkdust.
More from Chalkdust
News, Issue 18
Today's weather: seasonal, highs of π/18.
Covering infinity
Sophie Bleau uncovers the secrets behind covering maps
Handbook of equations
Forgotten how to draw a log graph? No need to panic – here's a handy guide!
Chalkdust issue 10 – Coming 24 October
Come along to our launch party for free pizza and the real quiz
Modelling blood
Blood is exceptionally complicated and its composition varies from person to person. So how do we begin to model it?
Two years of Chalkdust!
Here are some highlights of the first two years of Chalkdust!