shell because it is hollow and therefore represents the form of a shell which is also recognized as a shell structure
the sphinx is a mass/ shell structure
A pop can is considered a shell because it is a hollow structure with a thin exterior wall. It does not have a solid mass throughout, like a solid frame.
mass
mass structure, frame structure and shell structure
mass
it is a frame sturctures
A basketball is not a mass structure because it is not made up of piled up materials. For instance, a brick wall is a mass structure. A basketball is actually a shell structure.
eiffel tower is a frame structure.
its a frame
A crayon is a mass struture. It is a mass structure because it does not have a skeleton for a frame is does not hold anything it is, so it isn't a shell so it must be a mass.
sheel