Lefevres' photos are presented simply with captions, while Guibert's drawings include speech bubbles.

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Paul Notzold, a designer based in Brooklyn, has rigged up a system to project blank speech bubbles on to public walls.

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He generally sets up after sunset for better visibility and passes out leaflets explaining how to send text into the speech bubbles.

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The infamous publisher of anti-Catholic comics, Jack Chick depicts decadent popes lofting ominous speech bubbles, precisely capitalizing on the fact that such scenes make gripping graphic art.

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