I don't know why they frequently don't see me.
It can be awkward, if other people notice.
almost as bad as the streetlights going out as i get within 20yards of them...
I've had lights begin flickering, or explode, but not go out.
When doors don't recognize me, they do so at their own peril.
I discovered that a good solid hit on most such doors will convince them to pivot open on their emergency release pins.