Sculpture is usually made up of physical objects. The challenge is to bring something more to this physical form. Whether with emotions, thought or spirit.
Rarely rarely comest thou, O Spirit of Delight – and believes in livening us up rather than dragging us down. Philosophy of letter forms or not, it matters little.
I felt that massive great sculptures had much less sense of space than the illusion of space in a painting. And they even change very little as you walk around them.