Found another...

Here's another Edinburgh graffitti mystery I haven't manage to solve.

One of my earliest blips was of the S.H.E.I.L.D. I walk past on the side of the Carlton Hotel on Lothian Road. It seems to be a localized phenomena as there is another one outside the Usher Hall.

I found this one on King's Stables Road on my way to Focus today. Incidentally, Sibs at Focus apparently has some answers as the perpetrator is a regular in his shop. Sounds intriguing and I'll let you know when I finally get enlightenment.