autoclaved cellular concrete is a foamed concrete containing a high volume of air in a cell-like structure. the material is five times lighter than concrete, highly insulating and easily machined making it perfect for turning on a lathe;
Via DesignBoom
Added October 2009 :
This post is part of an experiment to automate the import of 20 of my prior Charblog | Tumblr tumblrings into this blog via Chairblog | Posterous which initially resulted in 20 posts without a title whereupon I had to edit it manually… Experiment failed:-)