There is indeed a 'S', not really obvious to see it though.
More important: there are much lines, light, shapes everywhere and in every direction, it makes the picture particularly difficult. Rather good, but complicated.
I keep staring at this image. It's full of interesting stuff - individual parts are incredible, very rich colors, movement, contrasts. And yet the how doesn't hang comfortably together. Or maybe it does. Intriguing...