reality

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It’s funny how the colors of the real world only seem really real when you viddy them on the screen. Alex, A Clockwork Orange (1971)

I don’t believe that the universe exists. I believe that the only thing that exists is God and he is more than the universe. The universe is an extension of God into space and time. That’s the premise I start from in my work, that so-called “reality” is a mass delusion that we’ve all been required to believe for reasons totally obscure. Philip K. Dick

My major preoccupation is the question, ‘What is reality?’ Many of my stories and novels deal with psychotic states or drug-induced states by which I can present the concept of a multiverse rather than a universe. Music and sociology are themes in my novels, also radical political trends; in particular I’ve written about fascism and my fear of it. Philip K. Dick, Dictionary of Literary Biography, Volume 8, Part 1 (1981)
The basic tool for the manipulation of reality is the manipulation of words. If you can control the meaning of words, you can control the people who must use the words. Philip K. Dick, How To Build A Universe That Doesn’t Fall Apart Two Days Later (1978)

Tetrahedron (Wikipedia) In geometry, a tetrahedron (pl.: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices. The tetrahedron is the simplest of all the ordinary convex polyhedra.

Reality (Wikipedia) Reality is the sum or aggregate of all that is real or existent within a system, as opposed to that which is only imaginary, nonexistent or nonactual. The term is also used to refer to the ontological status of things, indicating their existence. In physical terms, reality is the totality of a system, known and unknown.