If we use the pyramid in 3D, certain camera angles would depict a triangle, square, pentagon, etc. Is this something that we are expected to avoid, and taken into consideration for the art category? Unless the pyramid is at least partially transparent it will always be showing as some 2D shape.
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Yes indeed, but if we can see in 3D that it is a pyramid by rotating or walking around or multiple angles or lighting and shadows, than it is ok and you do not need to avoid that sometimes it can look like a triangle from a certain angle. Only if it always looks like a triangle and never can be seen as a real pyramid it is not allowed.