Artist or engineer?

Here is an advertisement that features Theo Jansen, the sculptor we are going to see.




He says:

"My name is Theo Jansen.   I’m a kinetic sculptor. My sculptures are made of very light materials, and they are powered by the wind. Part of me is an engineer who wants to map the progress of mobility. Another part is an artist who wants to sculpt the air that surrounds us and give it shape. And always I strive to push the boundaries of what we know, and what seems possible to us at this moment in time. The walls between art and engineering exist only in our minds."

Spanish architect Santiago Calatrava designs bridges and other structures in an artistic way.  This bridge in Calgary, Canada, was designed by him. First it was called the Calatrava bridge, but then the name was changed to the Peace Bridge. Can you recognize any of the machines in the beginning? Diggers, bulldozers, cranes...

He has also designed bridges in Bilbao:




Seville:




and this city of Arts and Sciences, which was built in the bed of the River Turia in Valencia.



So, are they artists or engineers? Or, perhaps we can say that they are both!