This form allows you to look up
flickr photos that are
tagged with one or more subjects (aka
tag intersections).
You can also get the same results by simply navigating to the url of your choosing to, but I prefer a painlessly simple user-friendly form.
Currently, this only allows a maximum of 7 tags. Keep in mind that the more tags you enter, the more filtered your topic becomes and so the smaller the result set.
If you can't find what you want, you might try simply searching all public photos, ignoring tags altogether:
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