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A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...

Tree houses, treehouses, or tree forts, are buildings constructed among the branches, around or next to the trunk of one or more mature trees, and are raised above the ground. Tree houses can be used for recreation, work space, habitation, observation platforms, or as temporary retreats. Shelter Tree houses are an option for building eco-friendly houses in remote forest areas, because they do not require a clearing of a certain area of forest...