Almost two decades ago I used a software called Rasterbator to dither an image into dots, blowing it up to multiple A4 pages one could then decorate a whole wall with. Up close it would just be circles of various sizes, but from a distance the image would show up. Super cool. Used it to decorate a wall in my dorm with a picture of the family dog.

Edit: found it. One picture taken from up close. Other pictures the whole image when laid out over multiple pages in the software https://imgur.com/a/OeaIWuY