Our knowledge of shape and form remains, in general, a mixture of visual and of tactile experiences... A child learns about roundness from handling a ball far more than from looking at it.
The whole of nature is an endless demonstration of shape and form. It always surprises me when artists try to escape from this.
A piece of sculpture can have a hole through it and not be weakened if the hole is of a studied size, shape, and direction.
A sculptor is a person obsessed with the form and shape of things.