One of these was the Simpsons cat Two of these could cause a fight Three of them and you can create a man.

I borders pictures, but I am not a wall. I provide structure, but I am not a spine. I have corners, but I cannot be turned. You can use me to capture a moment,

Each morning I slip through one small door. by evening, I return.

A slot machine that always pays, I darken bread and brighten days.

Useful for yoga or just to take a nap, if you add an extra t to the end of me I become a popular boy's name, no cap!