This is a mock-up of a place where grain was threshed to separate the husk (chaff) from the kernels of wheat. The material was trodden on by an ox and then throw into the air. The wind blew the husk away and the grain was caught in the cloth.
This is a mock-up of a room made to look like a typical Israelite meeting room such as the one that Jesus met with his disciples for the Passover or Lord's Supper communion feast.