Idea:

 

Tree is an exciting place to explore. Hierarchy of trees provides different spatial quality for human. People can sit under the tree, feel the breeze and take a nap. People can go up to the canopy from the bottom by the tree trunk. People can walk freely and play on the canopy.The lower part seems to be a normal shelter to shield oneself from externial conditions. The upper part is a spiritual shelter that shield oneself from the mundane world. 

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