Designing puzzles using spheres opens up a plethora of different elements, Stewart has created many versions over his career but this one has a cool charm to it and Andy did a very nice job on the box with lid.
Stewart wrote:
“This is a variation of Under Cover #197
using balls instead of edge-beveled cubes.
The four pieces pack into a cubic box, make a square pyramid pile that fits in the cover, and with one piece left out
form a tetrahedral pile.”
Note there are three challenges described in the box:
Problem #1. Fit the four pieces
into the cover to form a square
pyramid. Two solutions.
Problem #2. Use three of the
pieces to form a tetrahedral pile
inside the box. Two solutions.
Probiem #3. Fit all four pieces
inside the box. Three solutions.
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