A piece of code shaped like a donut renders a spinning donut in ASCII. Made by Andy Sloane:
via prostheticknowledge (with more explanations and links)
More code calligrams here.
Hebrew ASCII from the 1200s. Or micrography, as it’s also called.
On this page, the scribe has identified himself as Eliezer son of Samuel by creating a calligram in the shape of the letters of his own name. The calligram (lines of text of unequal length written in parallel rows and forming a design) is a continuation of the text of the previous page concerning the laws of the holiday of Sukkot.
A code calligram by Lord Nikon/Dekadence, 2014. The graphics are actually text that is actually code, and when you run that code, you get cubes.
The code you see, is what runs the show. A one kilobyte self-replicating Javascript program. The GIF is a bit sloppy, check it out live here.
Demonstrations of Most Complex ASCII Fluid by Yusuke Endoh 2012. The top one is a code calligram, where the code spells out Fluid and then turns itself fluid. Got an honorary mention in the Obfuscated C Code Competition.