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QR codes are graphic barcodes that anyone can print.
They're codes that can be read by devices that are "smart objects,"
meaning smartphones such as iPhone or Android.
The camera in these devices scans an image of this code,
providing access to a Web page
that displays content about the object, space or place associated with this code.
For instance,
you can have an extramural experience at the McCord Museum, which has an exhibit of exterior panels
with QR codes that provide information about the exhibit,
entitled "After Notman," outside the Museum.