The jury is out on whether smartphone users will take to QR codes in a big way.
But the Kraay Family Farm of Alberta, Canada, has proved they can be literally huge.
Canadian TV network CBC says the Kraays have just heard back from the Guinness Book of Records that their 309,570 square foot QR code, carved into a corn maze, is the world's largest.
And, at least in photo on the Kraay website, it actually works (taking you to, um, the Kraay Family Farm home page).
Check out this helicopter flyover: