3D Printer developed by Markus Kayser (http://www.markuskayser.com/) using the sun as its power source and sand as its material. I think this is fantastic.
Link to video (http://vimeo.com/25401444)
QuoteSolar-sintering aims to raise questions about the future of manufacturing and trigger dreams of the full utilisation of the production potential of the world’s most efficient energy resource - the sun. Whilst not providing definitive answers this experiment aims to provide a point of departure for fresh thinking.
The video is taking an age to load, but looks interesting!
EDIT.
Cool (or should that be hot?) demo.
What OS are you using?
I know from experience that the older mac operating systems have a slight trouble with vimeo.
here are some images.
(https://www.happyatheistforum.com/forum/proxy.php?request=http%3A%2F%2Fthisiscolossal.com%2Fwp-content%2Fuploads%2F2011%2F06%2Fsolar-5-600x337.jpg&hash=f75593d48a751229f289cfcfe02728b8055469b1)
(https://www.happyatheistforum.com/forum/proxy.php?request=http%3A%2F%2Fthisiscolossal.com%2Fwp-content%2Fuploads%2F2011%2F06%2Fsolar-3-600x337.jpg&hash=759e6d8282bcba80109353216adfe80d7533b1a3)
(https://www.happyatheistforum.com/forum/proxy.php?request=http%3A%2F%2Fthisiscolossal.com%2Fwp-content%2Fuploads%2F2011%2F06%2Fsolar-1-600x337.jpg&hash=d7ee34a1f3999edf1bc8496893e6522582ed77f8)
(https://www.happyatheistforum.com/forum/proxy.php?request=http%3A%2F%2F3.bp.blogspot.com%2F-L0-wzyLs_L4%2FTghM_vJPhoI%2FAAAAAAAABtI%2FWQ7gi9wJMSA%2Fs1600%2FMarkus%2BKayser%2BTriangulation%2BBlog%2B5.jpg&hash=0f3a836e1d13f421e8f4517d9f832cb758df2829)