mass : time+space
time+space : experience
experience : consciousness
No mass, no time+space
No time+space, no experiences
No experiences, no conciousness
Since light has no mass: it has no time, and no space.
Then light must be the conserved symmetric partner of consciousness.
In other words, consciousness can know what it knows because
light knows nothing. The anti-particle of the photon is consciousness. But according to physicists, the photon is its own anti-particle. This means that light through its self-interaction knows nothing and seeks to know everything.