“It’s a fascinating study, a truly groundbreaking advance in the ability to understand the photoreceptor mechanisms underlying color vision. The technical demands necessary to achieve this are enormous,” says Manuel Spitschan, who studies light’s effects on human behavior at the Max Planck Institute for Biological Cybernetics in Tübingen, Germany, and the Technical University of Munich and was not involved in the new study. “An open question is how this advance can be used.” {read}