Many of the pieces in the Hauptman Observatory were created to match the colors of the surrounding flora; like in the 4th shot. The attention to this details is as amazing as the work. It was very easy to walk past some of them as they blend in or your eye is caught by a more obvious piece. I wonder if it was as evident as his exhibition in St. Louis.
These beautiful pieces were featured in the Botanical Garden's greenhouse. You could almost swear they were growing. The sharp contrast between the insides and out are difficult to capture. Live viewing is a must.