Posted in response to a post in the scents thread. Once I post this, I am going to move it to a thread of its own because, while your post was on-topic in a thread about scents, mine would not be. Each summer, my uncle would mow land that my dad owned and sell the hay, after stocking my dad's barn full of hay for his (21, at one time) horses. We had a large barn, with a section for the cow stalls (we had five stalls, but I don't remember having more than one cow at a time). On the other end of the barn, lengthwise, was a shelter for the horses. In the middle was an area where a tractor and wagon full of hay could be brought in, with doors on both sides of the barn. Above the cow barn and the horse barn was the hay mows, which were lofts that ran along the length of the barn, divided by the section where the hay wagon could unload (the tractors were stored there otherwise). Both hay mows would be stacked to the ceiling with tightly-packed, rectangular hay bales, and then more hay would be stacked in the area where the tractors would otherwise be. By December, the hay in the area between the hay mows would be used up, and once enough of the hay in the mows were removed to allow us to move them around, we would re-stack them to form rooms and hallways, with steps, and other accoutrements, and it was very comfortable in these rooms, even in a Michigan February. Sometimes, we'd build forts in both of the hay mows.