NUMBERS 1 TO 100
the hundred chart · primes picked out in colour
Free
MULTIPLICATION TABLE
1 to 12 · colour intensity = size of the product
Free
THE BASKETBALL
four FIBA sizes with their circumference and mass — and why the rules set a bounce, not a pressure
Free
BALLS BY THE RULES
eleven sports at true relative size — circumference, mass, pressure, and who sets them
Free
IMPERIAL UNITS
convert in your head · without a calculator
Free