I like your conversion to mono with a nice range of tones throughout, it is far more preferable to the colour version, it grabs our attention much more effectively.
Well I have my team mates to thank for that. I was about to enter the colored one :)
Congratulations on your high placing for this excellent image that fits the challenge very well.
A fascinating image with so much detail to get absorbed in. A great title that immediately translates the image into the sort of work you associate with Escher, it works very well.
Technically it is very well executed with good DOF and detail throughout. I suppose it could be argued that the ISO is too high given your fast shutter speed, in fact I think with all the people it would have been a great opportunity to use a deliberately slow shutter speed to blur the motion of moving people which would have added another dimension to it.
I like your conversion to mono with a nice range of tones throughout, it is far more preferable to the colour version, it grabs our attention much more effectively. Your exposure is very well handled with good detail throughout.
An excellent entry thoroughly deserving of its high score, well done, Sid