They can be made of anything.
They can even be made of a gas - inside a liquid in a weightless environment, for example.
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Spheres
A Pyramid is a shape called a pyramid, there are no spheres in a triangulare shape.
form_title= Sphere Garden form_header= Decorate your garden with spheres. How many spheres do you want?*= {1, 2, 3, 4, 5, More than 5} What color spheres would you like?*= _ [50] Do you want the spheres delivered?*= () Yes () No
American footballs and Rugby balls are both considered 'balls' but neither are spheres.
No.