Anti tagging or untagging or negatagging or my favorite taxnotomy.
I want to emplement a system of tagging that allows me to describe what something is not. I think this would be very useful on flickr. For example a picture of a cup of coffee is not tea.
Here’s a good example of anti tagging in action on this Starbucks cup. To inform the barista that no water be added h2o was written and struck out.