Microbot, created by Dominic Pajak, takes any code that's entered into a tweet and runs it through an 8-bit emulator. It runs on the BBC BASIC language, which was invented by computer scientist, Sophie Wilson, who later went on to invent the ARM architecture used in iPhones, iPads, Raspberry Pis, and Apple's new M1 chips.
The structure of Microbot, namely its reliance on Twitter as a source for inputting code, limits any would-be artists to creating graphics with just 280 characters. As a result Pajak encourages contributors to use abbreviations, bytes tokens, and other clever shortcuts — a restriction that also turns the art project into a creative challenge.
If you're a fan of 8-bit art or coding, you can view an extensive gallery of all the graphics made using BBC Microbot (1,000 of them altogether) on this web page which also includes the source code of said creations.