Do your "lenses" actually DO lens-y (optical) things, Suzy?
For example, my cobalt faceted inside-out does strange things to my thumb or finger when I put it inside the vase, then look through the clear bit - my digit seriously seems to shrink.
(My Dad always used to say this was how to catch dragons. :thup: Look at them through a telescope the wrong way round, then, when it's miniaturised and has it's mouth wide open (which it will, it's attacking you) shove your arm in, past it's tonsils, right up to the tail, grab the end and yank hard and fast, turning it inside out. The mess can be easily lept in a match box until you find a proper bin.)