Be warned, this is a really really stupid question. I've just finished watching the new DVDs of Koyanaasquatsi and Powaasquatsi [apologies for the spelling!]. I don't know if it's the film stock or the lighting or what, but both have a distinctive appearance - colours are vibrant, everything is clear-cut. Now here is the dumb question - why does the same general 'look' not appear in other movies? I can't think of anything other than Baraka or occasionally a wildlife film (e.g. some bits of The Blue Planet) where one has the same surface appearance.