Cliff Van Eaton, BoingBoing reader in New Zealand, says:
Following on from the earlier Boing Boing post about New Zealand's scratch n' sniff postage stamps, here's another world first from NZ Post – "Action Replay" postage stamps. By using a special printing process known as lenticular, the pictures on the stamps appear to move when the stamps are tilted. By the way, the scratch n' sniff postage stamps have already sold out.
Link to online "Action Replay" Postage Stamps gallery with hot mouseover movement.