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Generate shadows without trees: vegetable awnings, a new way to generate shadows in the city.
(www.singulargreen.com)
I found these kind of cool as an idea, as they can be added rather easily to existing cities and provide some greenery without taking up space, while providing shade:
I had an office with a few of these canvas triangles high up above us below a bunch of high windows and it was beautiful! The way the window shadows hit the canvas and the way they shaded each other made beautiful diffused light and interesting shadow shapes.
If somebody had put vegetation on them the whole experience would've been worse.