Italian company Gallotti&Radice is well-known for their avant-garde designs featuring a variety of materials and shapes and these coffee tables are no exception. All vastly different, making sure at least one of them could work for most any space, they are available through the US-based M2L.
Layer by Luca Nichetto (above) features stacked wooden rings to form the base of this glass-topped table. They appear to be unsteady and may topple over at any moment but not so. The rings come in a variety of colors for you to customize.