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my toes
shell because it is hollow and therefore represents the form of a shell which is also recognized as a shell structure
Mass I think because foam is not a shell structure or frame.
This depends on the Definition of "Shell Structure" Most laypersons class a car as a shell structure. But for engineering purpose's?
chairs are shell/solid structures because it is a solid and can be considered a frame
frame structure
It is a shell because the structure is with a hallow, curved shape
A shell structure supports its self and a frame structure does not support it self.
A tent is a frame structure
frame structure
It is a shell structure so that it can hold stuff.
Shell structure
frame
my toes
solid structure
it is a frame sturctures
a teepee is a frame structre