Word for emergent image
What is this called?
I know it's a collage, but is there more specific term for a collection of a pictures arranged in a way that creates the illusion of a "big picture" from amongst them?
Bonus: What's a better word than "illusion" to describe that "big picture"?
Solution 1:
A photographic mosaic or photomosaic: http://en.wikipedia.org/wiki/Photographic_mosaic