In terms of real-life off-by-one errors, it's hard to beat the town of Wemding in Bavaria (Germany). Here a pyramid of 120 blocks is planned, with one placed e

In terms of real-life off-by-one errors, it's hard to beat the town of Wemding in Bavaria (Germany). Here a pyramid of 120 blocks is planned, with one placed every ten years. It started on the 1200th anniversary of the town, and is planned to be complete 1200 years later... and I'm sure you've spotted the problem. Matt Parker, the 'stand-up Mathematician' has a video on it: https://youtu.be/FAdmpAZTH_M?si=_u8fM-fprUWiEqZ9 https://youtu.be/FAdmpAZTH_M?si=_u8fM-fprUWiEqZ9