Mirrors.
My kids love to look at themselves in the mirror.
Truth be told, if I looked like them, I’d probably be checking myself out all the time, as well.
They can spend hours in front of the full-length mirror in my room. Just looking at themselves, this way and that.
Get two of them in front of the mirror, good times commence.
Get all three of them?
It’s a narcissistic marathon of cuteness.