The problem posed by vagueness is to explain its particular kind of indeterminacy. This is the "epistemological problem of the indeterminacy of data to theory". Single photons entering a beam splitter exhibit inherent quantum indeterminacy. However, the relationship between quantum indeterminacy and randomness is subtle and can be considered differently. An adequate account of quantum indeterminacy requires a theory of measurement. Karl Popper approached the problem of indeterminacy as a logician and metaphysical realist. Aleatory should not be confused with either indeterminacy, or improvisation. In the book Quine presented his theory of indeterminacy of translation. "I" is the degree of statical indeterminacy of the system. Stanzel quotes John Fowles in regards to the indeterminacy of narrative as an advantage. Three aspects of indeterminacy arise, of which two relate to indeterminacy of translation. There are various questions that can be asked about the above indeterminacy assertion. He defined motor coordination as a means for overcoming indeterminacy due to redundant peripheral DOFs. John Cage is regarded as a pioneer of indeterminacy in music.