Satirist Terry Pratchett uses this concept in his book Going Postal. The architect Bloody Stupid Johnson decided that having pi be some ridiculous number was messy and inconvenient. So in response he created a wheel where pi equals exactly three. This wheel is part of the inner workings of an organ. However, like many of his other works the organ did not function well as an organ. In order for pi to equal three, space bent in and around the wheel. This caused at least one unfortunate and one fortunate death as solid objects other than the organ itself and papers were ripped to shreds. The organ, however, found a useful existence in the town’s post office as a mail sorter. In fact, it worked too well. It began to sort letters before they were written. It then expanded to letters that might have been written but weren’t and letters that would have never been written. For this and other reasons the post office fell into disuse.
Bloody Stupid Johnson is also responsible for creating a sculpture of a triangle that has three right angles.