FLED-based solar engine:
solarbotics.net/library/circuits/se_t1_fled.html
en.wikipedia.org/wiki/Mark_Tilden
Schmelzolan plastic:
bastelweltcreativ.de/catalog/index.php/cPath/271_275?osCsid=1f440b4143e71a2e34e8b7187c8eb3df
billes-bastelecke.de/Anleitungen/schmelzolan/schmelzolan.htm
Photos:
flickr.com/photos/tserra/sets/72157623768963154/
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Mauricio Martins
Rita Carvalho
Tiago Serra