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'Packing 3D Shapes' printed from https://nrich.maths.org/
Use your common sense and intuition as detailed calculations are
exceedingly difficult and not really what the question is
about.
Keep your eyes open for shapes in nature where 3D packing
is exhibited
Once you are aware of 3D packing you will see that examples abound
in nature. It is fascinating to ask: why does this
packing of shapes occur?