Geograph - photograph every grid square

This is the set of prisms which amplify and direct the light in the South Stack Lighthouse. Sadly, this is the only photograph I could take from the top of the lighthouse. It was a great disappointment not to be able to go outside on to the gallery round the light, because from inside the lighthouse the railing round the gallery completely obliterates any chance of a decent photograph of the view. Health and Safety strikes again, preventing the sensible majority of people from perfectly legitimate enjoyment just in case one of the irresponsible minority does something stupid.