Geometry sampler

'Why don't you take us?' said one of the guys in the doorway watching me in the pouring rain pointing my camera at this.
'OK, if you like.'
Look of total alarm and rapid change of subject.
'Interesting wall, is it?'
'Well, I think so. Want your picture taken?'
Retreating fast into a dark corridor, 'It.. um.. only..um.. joke.'

Well, he wasn't half as photogenic as this wall, anyway.

Black and white in colour 69