Traditional wooden houses used to have a central pillar. The central pillar is also known as the "central pillar fairy". People put white scarf and butter on the central pillar as an offering. The central pillar should not be contaminated even a bit, and it is even seen as the symbol of cleanliness and dharma. This is because when farmers and nomads select their livestock that are to be killed, they tie the livestock to the central pillar and perform the releasing ceremony.