Zeitpyramide by Manfred Laber is a sculptural art work in Wemding, Germany designed to be a pyramid of 8×8, 6×6, 4×4, & 2×2 stacked blocks. The 4th block will be laid in the coming months & the the final work is scheduled to be completed in the year 3183. https://en.m.wikipedia.org/wiki/Zeitpyramide