Category: light...

light is any electromagnetic radiation, but especially that portion of the spectrum visible to the human eye
light travels through empty space at about 186,000 miles per second
light is the basis for the sensation of sight and the perception of color
taking a nighttime swim in a phosphorescent bay in Puerto Rico and watch light "drip" off you fingertips
Let light become your companion. Contemplate it. There is light everywhere, so just observe. Breathe in the sun's energy through all your pores
When the light has appeared, where does the darkness go?
recognize the Buddha-light shining in everyone
more information reaches the human brain through the eyes than any other sense organ - even so, the visual system extracts only a minute fraction of the information that is imprinted on the light that enters the eye