Intelligent, self thinking machines made of PVC tubes, ropes and plastic bottles which once a year he lets loose on a Dutch beach.
Watch him here explaining his creations during a TED talk, it's pretty amazing:
They use the power of the wind to walk and are able, through a mechanism that's explained in the video, to detect the water and stop when they reach it. He even was able to develop a system to allow the machine to fix itself to the ground when it gets stormy.
It's A.I. made of rubbish and it's wonderful to watch.
You can visit his lab/studio in Ypenburg by following the (very sweet and low key) directions provided on his website:
The location of the next straandbeest walk will be announced on his website in January 2014.