Writing on a wall

Grey grey grey grey
Waidaminute!
Sun! Oh my god! Sun!
Quick!
Camera!
Phone! Yes phone!
...fumble...
Letters cast on the front of a building. Black sharp edged shadow words.
Take another quick!
Letters now like smudges on brick. Gone.
Look over my shoulder.
The sun a bright, white disk
Its radiant glory hidden beneath a cloud the colour of a herring gull's wing.