Thursday, 31 December 2009

Polarised filter messages

If you were tricky, you could produce messages on polarised filters that you could stick up in plain sight, and they would only be visible to people wearing sunglasses with polarised lenses. Cool.

Mokalus of Borg

PS - Of course, polarised lenses are pretty common.
PPS - So "only visible with polarised lenses" is more like "invisible to people without sunglasses".

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