I love this idea for the Fourth Plinth in London, the only remaining unused plinth in Trafalgar Square. From BLDGBLOG:
A rain-proof planetarium machine could be installed in public, anchored to the plinth indefinitely. Lurking over the square with its strange insectile geometries, the high-tech projector would rotate, dip, light up, and turn its bowed head to shine the lights of stars onto overcast skies above. Tourists in Covent Garden see Orion’s Belt on the all-enveloping stratus clouds—even a family out in Surrey spies a veil of illuminated nebulae in the sky.
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