The mind isn’t empty, it is running a mile a minute which is why I’m starting at the wall I need to hang the shelf on as I consider all the options and related times I’ve hung a shelf and maybe I need to to laundry but also a ton of other stuff that isn’t related in any way.

Don’t worry, I won’t remember any of it hours later when I give up and do something else.

This doesn’t happen all the time, but it happens way too often.