Three Towers of Primes
thingiverse
Tower 1 displays the 168 primes less than 1000 on a stack of 16 prisms They fit neatly as the sum of the numbers from 3 through 18 is also 168. Tower 2 can display any 130 consective primes from the set of primes less than 10000. As given here it shows the 130 primes following those on the first tower. The third tower is a small ornament made by cutting tower 1 off after 6 layers. It displays the first 33 primes. OpenSCAD code is provided; changing a single parameter in tower_2.scad chooses other sets of prime numbers.
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