Well, first of all, this scene is clearly green and yellow, not orange and blue. This is not a common color palette. It's not a completely new color palette, be

Well, first of all, this scene is clearly green and yellow, not orange and blue. This is not a common color palette. It's not a completely new color palette, because that's a dumb concept, but it's not common. Green and yellow are analogous whereas blue/orange are complementary. Second, the orange / blue contrast is more of a film trailer / film poster thing than the actual films themselves. Most people will agree that trailers and posters are more purpose fit to marketing than art Third, it's not just a lazy trope, it's also because contrast is useful, and alternatives are not as easy to work with. Pink and purple don't fit most natural contexts. Orange has fire and natural light hues. Blue has the sky, water, and is a good way to imply darkness without the content actually being dark and hard to see (when contrasted with orange). Fourth, it's really not every movie. That's a lazy exaggeration. Googling top movies right now I see fewer than 1 in 10 movies has this color scheme on their promo image if we're willing to extend it generously to bright blue and yellow. Specifically Devotion (white, blue yellow); Emily the Criminal (blue/gold); Spiderman No Way Home (Blue, Gold, Red). It is also true for 0 out the top 10 shows and 0 out of the top 10 movies in the us currently shown on the netflix homepage (although netflix will swap these around for different viewers. I think I've seen some Glass Onion thumbnails that are bright blue/yellow).