Nice one Steve. Yep shiney objects can get a bit tricky with reflections etc just adds another dimension to think about :) Yes Andreas a penlight - or as the Americans say flashlight. just needs a beam that can be focussed in to a nice concentrated circle.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html