Core77

While we've all seen artwork projected onto buildings before, it's usually an unrefined process: Wait until it's dark out, aim the projector at a flat surface, do a little keystoning, and hit 'play.' But the crew over at Philadelphia-based Klip Collective likes to make their architectural projections a bit more precise, by composing them "to correspond harmoniously with...the architecture."

Although this embedded YouTube clip will give you the general idea...

...there are better, if un-embeddable, clips on their website; click here to check 'em out.