Terence Eden. He has a beard and is smiling.

Terence Eden’s Blog

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QR Tetris

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Designer Ming Ling has created the most wonderful QR code constructed out of Tetris pieces. The full size version is a work of beauty. As I've explained before, this works because the QR scanner sees the image in black and white - so light colours disappear. Anything else is covered by the fairly generous error correction. I'm nowhere nearly as talented as the above artist, but she has…

Hiding Space Invaders In QR Codes

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One of the lovely aspects of QR codes is the variable levels of error correction built in.  On even the most basic code you can obscure or deform up to 7% of the code and most readers will still decode it. This leads us in to the amusing territory of "hiding" human readable data in the code.  I say "hiding" because we are hiding it from the scanner - not from the human. One of the more famous e…

Invasion Paris!

· 250 words

I love nothing more that a tramp round a city. Taking the Metro in Paris is very simple - and fairly cheap - but the riches you discover wandering around make up for the extra time needed. A few years ago, Miss Geeky introduced me to Space Invader spotting. Dotted around the cities of the world are mosaics of Space Invaders. Placed there by a mysterious artist - seemingly at random. Before …