Perceiving light requires changing photon speed, triggering molecular events including calcium release and action potentials.

“Uh you need to bring them into stillness, right? You need to resist the flow of of of photons. And then so you change the speed of the photon and it's that change in energy. you get kinetic energy, speed of light [laughter] and then boom that when that that the delta v the the change in in in speed uh happens this is when you can you can trigger you a calcium release and then molecular series of events and action potential”