flame + sand = glass; glass + flame + sand = time.

The making of an hourglass:

The Hourglass from Ikepod on Vimeo.

"Director Philip Andelman traveled to Basel, Switzerland, to document the designer's modern take of the classic hourglass inside the Glaskeller factory. Each hand made hourglass comprises highly durable borosilicate glass and millions of stainless steel nanoballs, and is available in a 10 or 60 minute timer."

Music by Philip Glass ("Opening").

Via Braniac.