This is a self portrait after a long day. Its my way of tuning my mind with my body. I feel I captured the joining of two structures in this photo. I hope you agree. :)
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Really like the lighting in this. Unfortunately it was not "literal" enough for the bridge challenge. Don't let this result inhibit your creativity. :)
I'd crop this a little lower, to get the whole arm. Also, maybe more empty space to the top & right. Doesn't work for me, but you picked a difficult idea to convey.