The artist

Theo Jansen (born 1948) is a Dutch artist. In 1990, he began what he is known for today: building large mechanisms out of PVC that are able to move on their own, known only as Strandbeest. His animated works are a fusion of art and engineering; in a car company (BMW) television commercial Jansen says: "The walls between art and engineering exist only in our minds." He strives to equip his creations with their own artificial intelligence so they can avoid obstacles by changing course when one is detected, such as the sea itself.

How can you build a Theo Jansen's mechanism

You can use Lego, Mecano or other materials.
LEGO Theo Jansen's walker Leg

The Kids can try making less complex mechanisms

Balancing Sculptures - Science with children - ExpeRimental #10