Photoreceptors are sensors that tell plants about the radiation conditions around them. The best-studied photoreceptors are the phytochrome pigments, which are photochemically converted from biologically inactive to active forms by absorbing far-red photons. The active forms affect gene regulation, and the latest step in working out how they do this comes with the report of an interaction between the active form of phytochrome B and the phytochrome-interacting factor-3.