If you don't have an iPhone, the full content of the encoded paintings is accessible by smartphones that have QR code scanning capability and web access. For all other major smartphones I recommend free i-nigma.
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Delicious quote about qr code tech
"The technology was originally developed as a measure against communication noise for artificial satellites and planetary probes. It is capable of making a correction at the byte level, and is suitable for concentrated burst errors." (Reed-Solomon error correction)