Hourglass Pocket Puzzle Variety Box Modern thermometers may be more

Modern thermometers may be more accurate but the visual magic of Storm Glass has been enchanting weather prognosticators for almost 200 years

everything moves

and two six-hour beeswax candle sticks (though any type of candle may be substituted)

just to appreciate the simple elegance of the engineering

Hourglass Pocket Puzzle Variety Box Modern thermometers may be moreThis puzzle is made by combining two pieces each of two similar, but slightly different shapes. They are carefully calculated, with tricky movement added. It is impossible to unravel with one linear movement. Designed by Korean puzzle creator JinHoo Ahn. Made by Hanayama.