rūpaviṣayaṃ vijñānaṃ janayaccakṣū rūpasya prakāśakam ucyate vijñānaṃ tu na kiñcid rūpe karoti virūpasyaiva jñānakatvāt
The eye is called the illuminator of color because it produces cognition having color as its object; but cognition does not do anything to color, since what it cognizes is entirely formless.