Time now for a look back at artwork analogous to cave paintings, in terms of the digital world. Of course we all see high-def graphics on our computer screens every day. But it was not always so! Used to be you only got letters and numbers, and a blocky graphic on a screen by itself IF you were lucky. People spent ungodly amounts of time collecting these - you had to dial into separate systems all over the place, select them one by one, and then wait for them to download before you could even think about looking at them. A far cry from the web, eh?
For your perusal - BBS ads!
Low-bit raster based (Warning! Contains some girlie pictures. Nothing incredibly NSFW on the first page.)