This is actually how I envisioned his mind palace for about six months seeing the posts on Pinterest and Tumblr about some creepy looking dudes "mind palace" until I actually got around to watching the show. I thought he was gay. Turned out I was right.
Know what's cool? The fact that he just pretended to be in his mind palace, and they added the editing after. He just looks so intense... incredible.---> "I think that the intensity is in those incredibles hands"
Probly cuz Sherlock's mind palace sees John as this really smart doctor