The Rasterbator, right? Where you can rasterize images to make them huge, print them out in tile format on sheets of paper, then hang them on your walls? We were always a little bothered by the grid necessitated by hanging many individual sheets of paper. Until, that is, we saw this wall:
Each sheet of paper has been cut with a curve in the bottom corners and hung in an overlapping pattern, which gives the wall the effect of shingles. Absolutely genious.