(Collage showing partial light/shadows on small parts of these two sculptural installations, not the entire work, which you'll really want to see in person! GO!)
One of these installations I've visited repeatedly, and the other is new to me!
Lia Jianhua's Collected Letters (left) is a long time favorite; Afruz Amighi's My House, My Tomb (right) is new to me and on the right. If you follow the link, you'll get to see a video of Amighi's other work, and hear her discuss it. It's a great installation, and I love the story behind it.