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Old 08-29-2016, 05:16 PM
iamthewalrus(:3= iamthewalrus(:3= is online now
Join Date: Jul 2000
Location: Santa Barbara, CA
Posts: 10,861
Aside from the issue of force, round is an efficient use of materials, too. A round bucket that holds a given volume is going to require less stuff to make the bucket than a square bucket that holds the same volume.

Optimal (in terms of materials) would be a hemispherical bucket, but that would be awkward for a number of reasons.