is there a substance that you CAN'T see through?

[Mangetout]

*Originally posted by Hari Seldon *
Somehow this reminds me of the time I was in a Japanese restaurant and saw (and ate) some tiny fish that were totally transparent and virtually invisible–except for their eyes.

Are you absolutely sure they actually gave you the fish? I mean they could save loads of money by just giving you the two eyes on a plate and telling you it’s a transparent fish.