The mirrors in these three places (top  the
Kulturspeicher, chalk-factory, botanic garden) 
could join them together and be an accent to atract
human attention. They could be made in 2 ways:  
1.Tin mirrors going around like vindmill.
Material: tin painted with silver reflecting paints
(about 1x1,5 meter square).
2.Stacionary standing mirrors, reflecting 3 elements
water, sky, earth in variuos corner of one's eye.
Material: fabric or tent with mirror surface (about
3x5m square)