clipped from: mathworld.wolfram.com   
Tupper%27s%20formula

J. Tupper concocted the amazing formula

1/2%3C%7C_mod%28%7C_y/%2817%29_%7C2%5E%28-17%7C_x_%7C-mod%28%7C_y_%7C%2C17%29%29%2C2%29_%7C%2C

where %7C_x_%7C is the floor function and mod%28b%2Cm%29 is the mod function, which, when graphed over 0%3C=x%3C=105 and n%3C=y%3C=n+16 with

n==960939379918958884971672962127852754715004339660129306651505519271702802395266%20%0A424689642842174350718121267153782770623355993237280874144307891325963941337723%20%0A487857735749823926629715517173716995165232890538221612403238855866184013235585%20%0A136048828693337902491454229288667081096184496091705183454067827731551705405381%20%0A627380967602565625016981482083418783163849115590225610003652351370343874461848%20%0A378737238198224849863465033159410054974700593138339226497249461751545728366702%20%0A369745461014655997933798537483143786841806593422227898388722980000748404719%2C%20

gives the self-referential "plot" illustrated above.