QUESTION

New York, NY

Is one permitted to use a tree house on Shabbat in the following situations?

1. The tree house is built around the tree and is constructed using columns or other support from the ground, and neither the treehouse nor the ladder is supported in anyway by the tree. Would this be marat ayin to use on Shabbat?
2. The tree house is supported by the tree, but is constructed in such a way that there is an intermediary between the tree and the part of the tree house that you