This thinker asserted "What we cannot speak about we must pass over in silence" as the last of seven propositions discussed in one work, and used the "beetle in a box" metaphor to critique private language in Philosophical Investigations.
One of this thinker's works contains a "notorious paragraph" about a proposition that is simultaneously true and unprovable. Tom Stoppard based his fictional Dogg language on a scenario created by this man in which a builder asks another man to hand him materials, but "brick" actually means "here" and "cube" means "thank you". That idea is discussed in a work that distinguishes between "seeing as" and "seeing that" through the example of a "duckrabbit". This thinker asserted "What we cannot speak about we must pass over in silence" as the last of seven propositions discussed in one work, and used the "beetle in a box" metaphor to critique private language in Philosophical Investigations. For 10 points, name this philosopher who wrote Tractatus Logico-Philosophicus.
One of this thinker's works contains a "notorious paragraph" about a proposition that is simultaneously true and unprovable.
Ludwig Wittgenstein