The heroine, Lana, lives in a synthetic city and works as a pixel. Every evening millions of people, working as pixels, perform a 20-minute light show for the other citizens. They wear colourful robes and during each sunset they receive commands in the form of music through headphones. Each command means a certain type of movement, so that by moving/dancing, different parts of their clothes are exposed to the sun rays, thus reflecting the sunlight in different colours. All this can be seen on a huge screen in the synthetic city, where all citizens watch it.
After every light show all pixels receive a packet of energy which allows them to survive until their next dose. If a pixel makes a mistake during a show, so that the picture appears distorted, they are punished by not receiving an energy packet. If they haven't stored anything from their previous doses, they will not survive the next day.