Controlled variable in an experiment is called

objects appear differently in different lighting because they either absorb some colors (wavelengths), reflect it, or transmit other colors.

for example, if blue light is shone onto a red shirt, the shirt would appear black, because the blue would be absorbed and there would be no red light to be reflected.

Explanation:

as a person who takes a bunch of instagram pictures, lighting can either make or break your photos.