LOL @ all! I love the way this thread has split into 2 - the sensible answers to my query and the background nonsense..:-)) The more I think about (which is not a lot, but I do think about it), I think "the sky being darkened by the shadow of the cloud (except for the bit with the hole)" is probably the reason. (Oh, and yes I do know all about particles in the atmosphere giving the sky substance and colour - I paid that much attention at school.) And that the fact that Sky is blue is 'cos his date stood him up..:-)) (Yeah, OK, it's really 'cos the other colours get absorbed more due to their longer wave lengths...) Cheers, Diolma