I got one.
When building armored vehicles, surface area to volume ratio is usually a major concern. Basically, you want a lot of space with a little bit of surface area. To this end, a sphere is the most logical geometric structure. Because of the high profile of a full sphere, let's use a hemisphere. It still has a higher volume per surface area ratio than a box (which is basically all most modern tanks are), so let me ask a 3-part question.
One: why do we not see hemispherical or ovoid (technically oblate spheroid) tanks?
Two: what practical engineering problems does this style present? (I can think of at least one)
Three: how could these engineering problems be overcome?











