How To Make Your First Cardboard Chair Like These Ones?

Best Cardboard Chair in the World
I stumbled this on Instructables site on this link World's Best Cardboard Chair
Great project or past-time for engineering or architecture students or anyone interested to reuse, recycle or upcycle cardboard before it becomes a rubbish.

Here's another one from the same site a Cardboard Cantilever Chair. 
For sure, they may not be the first in the world or first prototype one but they are great looking models anyway.

Source: http://www.instructables.com