Create a set of wedge-shaped toy blocks which can be assembled without adhesive into a self-supporting dome. The blocks are held in place by compression.
One will need a temporary scaffold that then needs to get removed, which might be tricky at toy size. Arches are easier.
Is the reason Roman domes had oculi because that top piece, the dome equivalent of a keystone, is very difficult to hold in place by just compression? Is it because they had the shape wrong (I think a dome supported by compression should be a catenary of revolution, not a hemisphere)?
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