I am going to add my voice to the chorus singing the praises of the Wonder exhibit at the Smithsonian Renwick Gallery. The nine massive works in this exhibit each recreate or react to the wonder and power of the natural world.
Hundreds of carefully calibrated strings create a rainbow that seems alive -- shimmering as you view it from different angles:
A floating series of nets recreates the undulating force of the 2011 tsunami:
Thousands (millions?) of sticks are woven together to create an astonishing interactive structure:
Go. Go. Go. But try to visit on a weekday. The lines are LONG (and strollers aren't allowed on the weekends).