UPDATE 2024: Six years later, I came up with another related idea — is it possible to build a set of cubes in 3D so each of its six projections gives another QR code (with six different messages)?
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DOUBLE-SIDED QR-CODE
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UPDATE 2024: Six years later, I came up with another related idea — is it possible to build a set of cubes in 3D so each of its six projections gives another QR code (with six different messages)?