[gmku]

This is interesting. It's hard to figure out what exactly is earliest.

But...

I remember playing on the sidewalk around 2 or 3 outside our apartment on a sunny afternoon and becoming entranced by the distant sound of a plane in the sky. That same combination today--sound of a far off plane, sunny afternoon--has a strangely lulling effect on me.

I also remember around 2 or 3 seeing the Christmas tree in our living room and having this oddly existential moment where I thought to myself, There is the tree, and here is me. It's there, I'm here. We're two different things. I stood for a long time staring at the tree thinking about this.