I have no idea what its called...but...Caedes sells some prints, and one of the prints is the caedes logo but it's made out of a ton of pictures arranged so it looks like 1 big picture.

1) What is it called?
2) Is it done by hand or is there a program where you give a picture that you want the end product to look like and you give 1000 images that make up the big picture?

Thanks, I'm sorry to waste your time.