I have a “deceptive” glass in my small collection of interesting glasses.  A deceptive glass has very thick sidewalls, and thus holds much less liquid than it appears to when filled. In Georgian times coaching inns had them.  A coach would stop, passengers would rush in for a quick drink and be given it in a deceptive glass.  They paid for a full normal glassful of course!  I looked at the glass with its thick walls and thought, “That might act as a lens”! My camera was fitted with the Oly 60mm macro lens, so I just held the glass up against the UV filter on the front of that…