Three of a kind

In the evening the balls light up.
"In the upper half of each of the three gas spheres, there is an almost 30-meter-long line of red light, which forms a quadrant from the "north pole to the equator" of the sphere. The light for each sphere is generated by 150 high-performance LEDs (...). The light bands are mounted on the inspection ladders of the gas tanks. Although these ladders are basically movable, the artist designed the light bands for all three spheres to be aligned across the Prager Ring."

In due course, I will publish an evening photo of this.