Normally you might consider a smokestack to be something of an eye-sore, but this "Sky Stack" Is very much the opposite. With parts of it seemingly missing, the whole thing turns into an awesome fixture.
Sky Stack, designed by Hamburg-based asdfg architekten, sports five reflective rings around its neck that under the right viewing circumstances, make those sections appear invisible. Granted, it's not particularly convincing up close, but when the distance is right, its enough to make you double-take, and is surely quite convincing from a corner-of-the-eye glance. It's certainly the coolest smokestack you'll only sort-of see. I wish we could get one of those around here. [Designboom via The Daily What]