Signs of Arousal
There are times when a humble head can only focus politely on the shoes and socks of his betters from afar - however much he might be yearning to pay lip servitude towards them – if they deliberately choose to ignore him.
In particular, he must focus on the sock, keeping an eye out for any subliminal movement in the sock which might indicate sexual arousal in the wearer, since it is the only sign of sexual arousal a lowly head-in-the-wall footslave is ever likely to observe in a woman.