Magnetic ferrous particules from the toner cartridge of a laser printer danse on the invisible lines of the magnetic field of a magnet. Compressed 01 from Kim Pimmel on Vimeo.
Remember! This was long before the text reading on the screen of your mobile phone. We were using books made out of… paper. I kid you not! Here is how they made books in this long-gone era: YouTube link
Here is a Dimension SST 1200es 3D printer on the job of building 2 interlocked cube frames out of production-grade thermoplastic. YouTube link
The manufacturing process for colored ink is a relatively complex one, but it is also an impressively nice one. YouTube link
See what can be done with a few HP printers, a lot of free time and quite a load of imagination. HP – invent from Tom and Matt on Vimeo. Vimeo link