Agriculture comes in a variety of forms. Fields of growing plants (grains, vegetables or forage), pastures with livestock, orchards - these are the things that usually come to mind. There are other, more exotic forms of agriculture, of course, like rice paddies and cranberry bogs. Here in Berks County, Pennsylvania (and adjoining Chester County) we have the center of the mushroom industry in the eastern United States (California is also a major producer). a building like the one you see here, the Blue Mountain Mushroom Co., is called a mushroom house. Outside you will find composting to produce mushroom soil (horse manure is a major ingredient). The soil is sterilized and mushroom spores grow in rooms inside. After harvesting, the mushroom soil is removed and a fresh batch used for the next crop. Mushroom soil is highly prized by local gardeners.