The whole world was black and white and they were screaming colour | l.s.

Concept of colour:

Color (American English) or colour (British English) is the visual perceptual property corresponding in humans to the categories called red, blue, yellow, etc. Colour derives from the spectrum of light (distribution of light power versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Colour categories and physical specifications of colour are also associated with objects or materials based on their physical properties such as light absorption, reflection, or emission spectra. By defining a colour space colours can be identified numerically by their coordinates.

Or soulmate AU where Louis only saw black and white until he met Harry.

P.s.: it's my first fanfic ever and English is not my first language so if there's something wrong just tell me please.