QR (quick response) codes are barcodes you can scan with your smartphone's free barcode scanner (included on most phones) and they will take you to a website or display some information on your phone.
Japan and has been using them for years and they are slowly catching on here in the US.
This family farm has created the worlds largest QR code to date in the form of crop art. It's hard to scan from the arial photo so I've included a link to the code's destination.
Embedded Link
Welcome to Kraay Family Farm – Home of the Lacombe Corn Maze
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