SP One, What’s he thinking? #GVM004

Look at this flick, taken at 1:17 PM, Saturday 25 April 2015, at the Pep Boys Memorial Graffiti Jam in Jersey City:

SP One’s working on a piece, standing in front of a letter form at the left. But what’s immediately to the left of that letter form?

Now look at this shot, taken at 1:48 PM:

No one’s standing in front of it, so we can see it clearly. Knowing this is by SP One it’s easy to see that letter form at the left as a combination of “S” and “P”. The “One” to the right is obvious enough. Given the way I framed the shot we can’t see much at the far left, but what’s there seems to be pretty much what was there in the previous shot.

Now look at this shot, which I took much later in the day (early evening, 6:49 PM, hence the different light):

There’s a very obvious “S” over there at the left, on top of what appeared to be just background in the previous two shots. Was it part of the original design, of did it insert itself in process?