I could see that !
But let's say someone around you touches an other image... what a cacophony. You'd need a frequency for every image!
BTW iPods don't do FM unless you have the optional tuner. I found out the expensive way. It looked like a tiny Apple FM tuner, great! I bought it. Found out you need the iPod to make it work...
I'd see an other system based on your idea. When coming in the exhibit, you download the whole message base. When you pass next to one of these pictures, if you wish it, it triggers it's part of the download. It could be done with a bar code or RF device belonging to the exhibit that you plug on the iPod or other usb active device.
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