3D Auxetic model
An interesting animation by Adrian Rossiter of a 3D model showing 2D auxetic behaviour.
R. Gabbrielli's blog
Lightweight structures
For those of you interested in the geometry of light frameworks and models for extremely porous materials, here are a couple of links. The first one contains two 3D objects. You need Java to view them.
http://people.bath.ac.uk/rg247/swansea/javaview/gyroid_146_007.html
