GALLERY OF DESIGNS — click a thumbnail for a larger version    Theatres
	Suppose we want to add even more seats, bringing the total to 768 on the main level. The stage is probably large enough already, so we can keep its diameter more or less the same.  As a result, in this version the stage plan changes from convex (a circle) to concave.  Different arrangements of steps and platforms are shown for the three entrances.