Invert colors purpose?

Wife just showed me if you goto to settings > general > accessibility > invert colors you can make your phone look like a photo negative. This may have been discussed before but I couldn't find it. If it has I am sorry, but I was just wondering what was the purpose of this, seems harder to read

How to Invert Colors of Video/Photo for Free

How to Invert Colors on an iPhone

NegativeScreen

How to Invert Colors in Digital Photos?[2023]

How to Invert the Colors on a Picture (and Why You Might Want To)

Optical Illusion Of This Woman's Face Baffles The Internet

How to Invert Colors on Procreate in 2023

How to Invert Images with Pixelmator on Mac

The Inverted Colors Challenge - Web Design Ledger

How to Invert a Picture on iPhone (Flip the Color)