We first mentioned Ombrae back in 2008; it's a manufacturing process by Quin Media Arts & Sciences Inc. that uses software to translate images into "optical tiles," raised and angled pixels, that can be machined into metal to create wicked pixelated displays.
We recently looked into Ombrae again to see if there'd been any developments, and unfortunately uptake looks slow. However, we did find this cool video--check out how the image changes depending on where the light is: