This is one of coolest and geekiest things I’ve ever seen. From Mathworld:
J. Tupper concocted the amazing formula
where |_x_| is the floor function and mod(b,m) is the mod function, which, when graphed over 0<=x<=105 and n<=y<=n+16 with
n==960939379918958884971672962127852754715004339660
129306651505519271702802395266
424689642842174350718121267153782770623355993237
280874144307891325963941337723
487857735749823926629715517173716995165232890538
221612403238855866184013235585
136048828693337902491454229288667081096184496091
705183454067827731551705405381
627380967602565625016981482083418783163849115590
225610003652351370343874461848
378737238198224849863465033159410054974700593138
339226497249461751545728366702
369745461014655997933798537483143786841806593422
227898388722980000748404719,
gives the self-referential "plot":
