What I find remarkable about LEGO is what it's taught me about sculpture: the ability to give the impression of something, letting the mind fill in the details. LEGO bricks are actually quite simple, yet they can create some very intricate designs.
Take a look at the lattice work in Rivendell. If you study it closely, it's actually some very basic parts, yet the effect is this intricate pattern that provides a great amount of depth to the scene.