They have LEDs and light up at night too.
Good Magazine has more, inluding photos.
Comprised of 15 flower-shaped photovoltaic solar panels that line a pedestrian and bike path on the greenbelt between a retail lot and highway I-35, SunFlowers was unveiled on July 30. In such close proximity to a prominent highway, the 30-foot structures are, as Harries/Héder put it, “a highly visible metaphor for the energy-conscious city of Austin.” But because each one is a working solar collector, the art piece is both emblematic and functional.