sentences:  Made up of over a hundred vertically oriented steel sheets, the 8′ (2.50 m) tall sculpture provides a metaphor for the counter-intuitive world of quantum physics.Symbolizing the dual nature of matter, the sculpture seems to consist of solid steel when seen from the front but nearly disappears when seen from the side, as light shines through the spaces between the slabs.In 2007, Voss-Andreae created a second version called "Quantum Man 2" in stainless steel.