That would be Amy's Big Agnes something or other.
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They abide by the Climbing Rope technique of Tarpage---string a stout long climbing rope to two trees and tighten tremendously and throw over a couple big tarps---leaving room at both ends for 7 kids to come and go---thru both ends. They could lower one end to ground level at the tree trunk but then access would be difficult for those on that end.
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Rope in Action.
One disadvantage to their two tarp system is creating a leaking seam midway down the rope---whereby rain water drains thru the seam. This could be prevented by lifting one rope much higher than the other and shingle the high tarp over the low---something they often forget.
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Btw---Big Agnes also makes BIG TENTS---
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