It was just a few days ago that a card arrived from the United Arab Emirates (UAE) with wonderful stamps. The stamps are gold coloured which never does scan very well but - to me - the remarkable thing about the second two stamps is that they are transparent. If you click on the image for an enlarged view, I think you can see it more clearly because the vertical lettering from the postcard can be seen through the stamp. They commemorate the Second Arab Stamp Exhibition
The card itself is also worthy of mention because it shows a wind tower or windcatcher. This is a traditional Persian method of natural ventilation or air conditioning. You can find a good description of how it works on Solarpaedia.
This is a post for Sunday Stamps, now hosted by Violet Sky at "See it on a Postcard!"