I always found these online versions of Wittgenstein's Tractatus very enlightening, because the entire book is hierarchically structured and thus lends itself t

I always found these online versions of Wittgenstein's Tractatus very enlightening, because the entire book is hierarchically structured and thus lends itself to top-down exploration (which doesn't work well in traditional books): http://www.tractatuslogico-philosophicus.com/ http://www.tractatuslogico-philosophicus.com/