Some do, some don't.
For regular tessellation, you require the interior angles to be a factor of 360 degrees.
An octagon will not tessellate.
On the other hand a triangle, which does not have an even number of sides, will.
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No, but all squares are rectangles because a rectangle is a four sided shape with at least two even sized sides where a square is a four sided shape with all even sides
Assuming that the wall is even sided, a rectangular prism.
a perfect square; it is an even number of sides (4); and all sides are identical
At least one of the sides must be curved for a two sided shape. If the curved shape is part of a circle you will have shapes like a segment of a circle, a crescent or a convex lens. The types of shapes can be increased greatly if the curved side can be elliptic, or even better, just a wobbly line.
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