I should also add that undoubtedly, cells are only hexagonal because they are "circles squished together", and the bottoms of the cell is structured to accommodate cells on the other side of the comb. 

Evidence for this position is queen cups/cells.  The bottoms of the queen cells are concave surfaces, not 3 lozenge shaped plates, and the interior of the queen cell is round.

There may well be other interesting details as to how a hexagonal cell behaves compared to a round one, but mostly it is to pack the cells tightly together, and to use a minimum of material in doing so...both are accomplished by the wax comb bees build.

deknow

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