Paradox Hourglass

Alles ist verkehrt! Ein echtes Highlight am Schreibtisch, im Wohnzimmer, im Bad…
The sand in this hourglass runs upwards because its plastic granules have a lower density than the surrounding liquid. The liquid is non-toxic! The stated run time is an approximate value, because the viscosity of the liquid strongly depends on the ambient temperature. The diameters of the granulate used and the weight of the granules may also vary. The run time is about 4-5 minutes.