Can some kind graphic designer or art historian pinpoint what the art style (including the colour scheme) of the new app icons is based on? (Most obviously Phot

Can some kind graphic designer or art historian pinpoint what the art style (including the colour scheme) of the new app icons is based on? (Most obviously Photos, Camera, Clock, Game Center and Newsstand.) I know that it's a (probably) mid-late '60s colour-printing, cartoon-art or children's-book style (based on cut-outs or stencils?) but I can't identify it any more precisely than that. In a way it's strange that iOS would adopt these icons at the same time that it's ripping out the skeuomorphisms. After all, beyond the complaints about wasted space, distracting textures and so on, the fundamental thing people have against skeuomorphism itself is that it's a put-on, a kind of play-acting. But so is the self-consciously retro and "themed" style which has now been applied to the home screen. I really like the icons, on the whole, though the new default background is too much. But they're too much of a novelty for me to want them at the centre of my life and work - which is where they will be for iPhone users - for (say) ten years. Not that anyone is even contemplating leaving them on the home screen for even four years, of course. But that's just the thing: they may (or may not, flame away) be good design, but they're unequivocally not timeless design. Or really minimal, self-effacing design.