Inside Out, Pixar’s new film, offers a helpful insight – and reveals the unexpected pressure to be ‘happy’Like Yves Klein’s deep, uncomfortable blue, Pixar should patent the particular happysadness you feel when you emerge from seeing its films. The teary wonder at nature and humanity that comes from watching anthropomorphised lamps fall in love and causes one to skip from the cinema, leaping over a puddle of yeah-that-was-definitely-vomit, to shrug regretfully at the guy who failed to nick your wallet outside Wasabi, and to fall asleep with a magical sigh, and to dream.