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.
Ode to Newtonian mechanics
(after Sonnet 130)
Chalkdust issue 10 – Coming 24 October
Come along to our launch party for free pizza and the real quiz
Complex numbers and algebra
Exploring the beauty of complex numbers, their origins and why they are important
The pipe singularity
In the Aztec city of Atzlan, the scientist Remotep makes a revolutionary discovery
Interstellar travel: the mathematics of wormholes
Matthew Wright looks at wormholes in sci-fi