Even a bridge has feelings 

Visitors to Heureka, the Finnish Science Center in Vantaa, cross a gently swaying pedestrian bridge spanning a river. The bridge pylons shoot skyward like masts on a sailboat. The beautiful minimalistic bridge is also smart: it senses vibrations in its environs. A small spot at the end of the bridge is covered in a thin layer of conductive piezopaint that monitors vibrations as pedestrians cross the bridge. A small area is enough because the paint is as sensitive as a child’s skin.

There are many useful applications for the sensitive epoxy-based piezoelectric paint developed by VTT Technical Research Centre of Finland, Helsinki University of Technology and Tikkurila. It can be used to inspect the condition of different structures, monitor the durability of welded seams on steel structures or monitor vibrations in buildings around large construction sites. The paint may also be used to monitor vibrations from wind loading on wind power generators.