Sculpture is the branch of the visual arts that operates in three dimensions do you know any thing about it?
I have heard of sculpting. Do you know any famous sculptures? 
Cubist sculpture
I see, what else do you know about this?
Cubist sculpture developed in parallel with Cubist painting, beginning in Paris around 1909 
That was a long time ago. What does a cubist sculpture involve? 
Cubist sculpture is rooted in Paul Cézanne's reduction of painted objects into component planes and geometric solids; cubes, spheres, cylinders, and cones
When was Paul Cézanne born? He sounds like a famous person I should know about.