Can you scan an array of cookies laid out in the form of a QR Code? Yes, here is proof of it. Shows the robustness of the code form. I tried it with my phone and it scanned fine. More in Engadget here. Other marketing ideas related to this? You could have a group of people with black and white hats arranged in a square. Viral effect works at least.
An advertisement for Oreo cookies.
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