Think of a box. It can be any box you like. Any size, shape, color, texture, anything.
So, one time, someone told me to describe a box. It could be any box I liked. I did, and then they explained it was one of those psychological hacks that described your "ego," meaning in this case how you think and feel about yourself.
The crazy thing is just a couple days later I was out shopping, and I found my ego box!!!!! Seriously, though. I described this box out of any box in the entire universe. And I saw it just a couple days later. I think it must be a confirmation of my ego or something;)