A thought on my month in Vienna (in 1987).
A very nice clean safe city full of nice people. However there are two extremely ugly buildings in Vienna. I tried to find a photo googling Vienna skyline but they seem to have been carefully kept off the web. They are huge rectangular towers with no windows. They made me think of miniluv in Oceania circa 1984.
Finally a nice Viennese person explained to me that they were anti aircraft towers from WWII and that, since the weakest material in them was concrete and the rest was steel no one had any idea how to knock them down without smashing all the nice little Viennese buildings near them.
This is a minor problem in city planning. I had an Idea. The towers have plain flat surfaces which are boring. How about painting them white and projecting something on them ? Now this would be very public and unavoidable (as the plain concrete is at the moment). That means that films or something would be innappropriate.
I would advocate taking extremely high quality photos of great works of art and projecting them. Also photos of beautiful Austrian nature would be nice.
The idea is that too much municipal eye time would be monopolised by a mural,l so a changing non controversial photo display would be about right.