Tree, by Simon Heijdens, is projected onto several facades in the city, including dark corners and alleys. The main location has a 3x8 meter drawing of a tree projected onto the facade of a building. The branches and leaves move slightly, with an intensity that depends on actual wind gusts.(Found here)
The tree also reacts to sound (the leaves fall from noise), and is sensitive to what happens to other trees in the city. Ahh, the beautiful empathy of inanimate objects. So perfect, direct, immediate.
Watching the new artistic inventions these days is like looking at a wonderful playground. You just can't get enough watching, it all seems fresh and new and unexpected - but at the same time you, I, can't wait till the next step.