even I, with my CS degree, can stare at a screen (or grocery shelf), frustrated, and not see the very obvious blinking whatsit that I’m looking for.

At least it’s not just me then. I sware my girlfriend stores things in some secret pocket dimension in the fridge. I open the door I look very very closely and there is definitely no butter in there, then she goes to the fridge opens it and pulls butter out. Where did the damn butter come from?