The OVUM project of the german artist Armin Kölbli sets signs of consciousness:
Formulated thoughts, which breed long time in oversize egg sculptures at exposed places of this earth.

Thus OVUM sculptures are in Chernoybl (1999) and in Kosovo (2001).

And soon in Jerusalem.

More informations under www.koelbli.de.

See also https://www.youtube.com/watch?v=trZMy4fEKdA and 

 http://youtu.be/TQgUEseatwQ