One section of this work produces a picture of a cube in order to show that seeing two phenomena
 implies "we are really seeing two facts.
One section of this work produces a picture of a cube in order to show that seeing two phenomena
 implies "we are really seeing two facts." The author compares this work to a ladder, which the reader must
 "throw away after he has climbed it." This work rejects the notion of "logical constants" that defined the
 writings of Frege and Russell as its "fundamental idea," and defines the world as "everything that is the
 case." It depicts facts in "logico-pictorial form." It begins with seven fundamental propositions, and claims
 that "what we cannot speak of we must pass over in silence." For 10 points, name this work by Ludwig
 Wittgenstein, whose ideas were redacted in Philosophical Investigations.
One section of this work produces a picture of a cube in order to show that seeing two phenomena
 implies "we are really seeing two facts.
{Tractatus} Logico-Philosophicus [or Wittgenstein's {Tractatus}]