Finding the change

After work I met a writer friend and we had quite an intensive discussion about writing - how we do it, who it's for, what our preoccupations are... A new experience when we parted company and I got my camera out: I needed to do some 'warm up' shots to help me switch from one mode to the other. Photographs felt quite clumsy for about ten minutes.

Thank you for indulging my riddling bit of writing yesterday. If there's anyone who isn't bored stupid with the whole thing, I've now pasted another version below the original showing the hidden numbers.