Paul Ferragut's Time Printing Machine uses felt pen, blotting paper, and a time based algorythm to create an amazing "pixelated" aesthetic.
"The time print device uses blotting paper with Letraset felt-pen. The felt-pen ink bleed in the paper for a duration relative to the grey value of a pixel. Every "time stain" gradually recreates any images in a pointilist style. This device was made for my MA project more info at www.convivialtool.com" - Paul Ferragut. See more;
The program made with openFrameworks does possible to upload any picture and to set the pixelization, spacing and printing time.