“…as we grow older … seeing becomes dulled. We begin to look in a practical manner just to get enough information to function. We know where the doorway is so we don’t walk into the wall. We spend more and more time mentally running around, looking at one thing, thinking of another.”
— Albert Handell and Leslie Trainor Handell, Intuitive Composition, page 12
How many different doorhandles did you touch yesterday? How many doors opened to the left and how many to the right? What colours were the doors?
While there’s no point clogging up our brains by remembering such things, does it mean you also don’t notice unusual doors because you’re in “going through a door” mode?
When is a door not a (everyday) door?

When it makes you stop and wonder what is on the other side.