I found this photo of a beautiful large spiral-shaped sundial that looks like it might be another rare human gnomon horizontal dial.
It's located at Argyle Square in the Melbourne suburb of Carlton, Victoria, Australia. See the rectangle with little boxes in it on the meridian line? I think these little boxes are human height markers. To use the sundial, one stands on the box that corresponds to his height. But it is difficult to see what the text is inside these little boxes because the photo is not very large. http://www.flickr.com/photos/adonline/2895001478
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