Space Invaders?

Space Invaders or just a mosaic heart?

It all started in Paris, it continued in London, Tokyo, Amsterdam, New York and Sydney.

Alien beings has been observed on house walls in dozens of cities all over the world. Secure sources announces that also Linköping has been hit by those alien beings from outer space. Until now it is not known where in Linköping the first observation was made!

Source: Geocach GC16NPH Linköping Urban Invasion