I'm pretty sure that wallpapers are something you put so that others can see.

it's black when I close my eyes since I was born!

Mine's #333 since 2003... is what I'd like to say because it rhymes, but it's actually since 2013.

I tried black, but it's easy to confuse for the monitor being off since I don't have any fixed elements on the screen.

I have found my people! The solid black wallpaper reinforces in me the idea that computers and phones are tools, not accessories and it has been revolutionary. I now try to use more and more things in their default state. Vim instead of NeoVim, and an empty vimrc. The shitty fonts that ship with the distros, rather than Source Sans 3. That hopelessly ugly yellow Matlab Current-Section highlight colour. I love them all!

It was staggerging to me just how much easier it was to stop, breathe, take a moment to change my mind about the fact that some config needs changing, and instead just say "it's good enough".