Numbers are easy. They are the same no matter what. A six is always a six. Six dollars will always be six dollars. If I set six dollars aside for rent, it's going to be sitting in its little electronic box waiting for me to spend it on rent.
Physical things are much more abstract. They're different sizes. Different shapes. Different consistencies. Some things exist until they're consumed and then they're gone. Some things are in the process of becoming other things.
I'm genuinely shocked that ANYONE can intuitively know what to do with all these things. It's taking lots of studying and research to start to form ideas, and even still, some things elude me.
This post doesn't have a good ending. I like money. My apologies if you hate the number six. How do you feel about numbers?