Until the concrete sets up into a solid, it functions like a liquid, and instead of being a load resisting element, it is a load producing element!

FORBES: Why Can't We Start Building The World's Deepest Building?

Last weekend, the museum revealed, albeit temporarily, the other main element of this permanent sculpture, "The Slot, " a 456-foot-long, concrete-lined trench adjacent to the Resnick Pavilion.

WSJ: Levitated Mass | Arrival of a Rock Start | By Arnie Cooper