This is the beginning to a double sided table exhibit here at the SMM. (work) 

 The two tables will be backed up to one another. This was the first day of construction and a lot his left to be done.

 All of the corners have been notched to fit snugly around the 3" tube legs. This creates a much stronger weld joint and looks cool too. But just about twice the work as a normal butt joint.

 These two tall structures are going to be vertical wind tubes that will be integrated into the two tables. Each will house a fan/blower at the bottom to create a vertical wind tunnel. Visitors will then be able to create their own flying objects to but into the tubes to test their design and see how it flies.