Why do we need self-expression?

I guess we like to create objects, or write, because it gives us a chance to get that thing out of our heads and into the “real world” (‘physical world’ would be a better term for that).

When I take something out of my head it ceases to exist merely in my head. It becomes visible, turns into a part of the world. Has a chance to survive. To be forever. Captured.

People can see it. I can see it. It’s real. Or more real to me than it was before, in the confines of my skull. If it made it into the physical world how can we say it doesn’t exist? If it’s…