I've seen this poster numerous times in hip homes in magazines, and always liked the message. Lately though, it's been on my mind more because this store that I walk past everyday has about 5 of these posters displayed in the store window. It got me curious about where this poster came from. It turns out that the poster was commissioned by the British Government's Ministry of Information during World War II as propaganda to be posted throughout the country upon the outbreak of war. The poster was never officially issued and thus was not known to the public until it was rediscovered 50 years later at Barter Books, a second-hand bookshop in Alnwick, Northumberland. Crown Copyright expires on artistic works created by the UK government after 50 years so the image is now in the public domain. These days, the design appears not just on posters but also on t-shirts, mugs, rugs and even lounge chairs. This is a great source of products though I'm sure you could find stuff in Etsy as well. Right now, I have it as my computer's wallpaper, but I'm thinking of displaying a printout in my cube as well. It's a good phrase to latch on to on days when you're feeling utterly overwhelmed.