Rectangular ice slabs with seeds embedded in them are placed on top of a rammed earth pedestal, seeds also in some layers. The ice allowed to melt, and the grass to grow, breaking apart the plinth.

Rammed earth pedestal with ice on top, outside.
Soil cube and broken soil, taken outside.
Red sprouts, on rammed earth.
Detail of sprouts in dirt.
Green grass growing out of soil mound, outside.
Green grass sprouting out of dirt blocks, taken outside.