This is a great concept from designer Jinsun Park of South Korea. It's currently just an idea (with quite a few stumbling blocks) but it could become the future of the multicolored pens we used to use as kids. Remember pushing the knobs down to pick one of six or eight colors you could write with? Well, this definitely steps it up to the next level. Just scan the color you want to use and it's instantly available as ink inside your pen. It's perfect matching at its finest!
Via Popsci, via Tuvie. Actual product that's similar: I/O Brush from MIT Media Lab, though not yet a consumer product.