Door Knocker Gnomons
 
Looking at that SGS on Carl's webpage got me thinking.  Has anybody ever seen a vertical sundial on a outside door of a building that has a door knocker that doubles as a gnomon?  I wonder what the best type of gnomon would be?  A cone or a triangular gnomon might stab your visitors in the eyes.
 
How about a ball on a rod? The rod could hang down from a hinge. The ball at the end of the rod would be the door knocker.  I envision a pretty brass sundial bolted to the door with the brass door knocker gnomon hanging down in front of it.  (You could even attach a little handle to the rod and it wouldn't cast obnoxious shadows.)
 
Tony, are you listening?  This sounds like something you could do.
 
John
 
p.s. I didn't see a door knocker on Carl's door SGS.  I guess a doorknocker on stained glass wouldn't be such a great idea!
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