Manfred Laber’s public art piece in Wemding, Germany, doesn’t look much like a pyramid yet. That’s because a new concrete block is laid only every 10 years; the structure was begun in 1993 and will be completed in the year 3183, when the 120th block is placed at the top.

Altogether that’s 1,200 years, the town’s age when Laber conceived the project and laid its foundation.