part of the fixing of a security camera or thing?

nope

a bed or some sort of railing?

it's not, but now i've realised that i don't actually know what it is ! i know what profession it's related to though and i know the man that owns it so i can ask.

so i guess the revised question is 'what type of person has a shadow like this' ?

I give up! so - who is it, what is it....please!

i'm not entirely sure what is it, but it can be found in an optician's room. i'm not even sure what an optician's room is called - office ? surgery ? studio ? lair ?

so, i'll take an action to find out for you by emailing the chap who owns the equipment which caused the shadow and what an opticians' room is called.

oh, surprising! - what is an optician's room called?