A granary built on pillars which lift it above the ground to protect the stored grain and produce from water seepage and the pillars are topped by the so-called ‘staddle (or Steddle) stones’ which prevent the access of rats and vermin. Being raised up, the air can freely circulate beneath the stored crops and this helps to keep it dry.
The Pillars I made from 1cm blocks of polystyrene, the Staddle Stones from squares of thick Card.
When looking for examples of Medieval granaries I came across loads of examples, some from the 15th century, that still exist in the North of the Iberian Peninsula and called hórreos or paneras. Hórreos are built with 4 pillars, the Paneras have more than 4.