Magnetic Hidden Messages

There's a message in the flux

This hidden message was created by placing 1/4" cube rare earth magnets on 1/2" centers in a 5 x 7 matrix to represent each letter. The hidden message is viewable via a "magnetic viewing film". You could sprinkle iron filings over the message as well, but that gets messy.

This project was also written up for Make Projects with new pictures and information:  Magnetic Hidden Messages