The Number Line

This is the number line from 1 to 24 made out of Lego.  Each prime has its own colour, and you multiply primes by putting them on top of each other.

You can see interesting things straight away, like:

• the first tower to be taller than all the ones before it is always made up of only blue blocks
• 8 & 9 are one-colour towers next to each other - Catalan's conjecture tells us this is the only time that happens

Here is the number line spread out so that each prime gets its own row. This makes it easier to see how the patterns repeat.