The new exhibit is made from plastic bottles with filaments that light up at night and change color. The photos below are of the largest sculpture (about 5 feet tall) in light and darkness.
There is also a field of 4x4x8 blocks of bottles. It was amazing at night. My photo is a bit dark but you can see that there are many of these sculputures with a mountain as a backdrop.
There were also lights going up several of the mountains, small flower structures in the cactus garden
and even some fire flies. If you have some time and want to enjoy the warm weather in Phoenix stop and check out this great exhibit - 6-9pm every evening at the Desert Botanical Garden. We even got in free with our membership from the Arboretum. Reservations are suggested. Call by phone for free tickets with Arb membership.