Look! Look at this! I ordered one just like it, though in a more burgundy/browish hue.
This was a poster designed during WWII in England. I don't think it was ever actually distributed. It was recently discovered and is making a big comeback in many different colors. I love it so much. Whenever I feel myself getting agitated, worried, stressed, anxious, annoyed.....I just say this to myself. And it totally works. It is magic.