Windows

Does he not understand the physical properties of glass?

Specifically,

transparency,

or that the barrier of the material is not an indicator

of one's relative proximity

(to the other side?)

He does realize we're right here 

- right? - 

Or did he somehow get this far in life

under some sort of misconception that 

"opaqe" and "clear"

are, indeed, synonyms?

No. Maybe he just missed that day in school

Or maybe he has never painted his nails

Or used a camera

Or bought a light bulb

Or ever had to distinguish between two types of pantyhose.

But HOW?

How does he look at us like that

Why does he look at us like that

He must not realize that we see him

(reluctantly)

Every twitch

every tweak

every move of every muscle

on his face, that same face who was must have been absent that day at school

when the kids also learned that saying about not throwing stones if one lives inside a particular type of house.