Just in my lifetime, some of the redwood trees near my mom's house have doubled in size, but as a kid they seemed big enough to be awe inspiring. In my memory, our treehouse in a redwood tree seemed like it was half way to the top. But if I peek under the branches, I see that it was just a few platform boards and a roof, about twenty feet high. You can barely spot it above and to the left of the old ladder. We completed the climb using the giant branches.