  A rather similar theory of perception is given by Plato in Timaeus 45b–46c, 67c–68d. This fact has much exercised scholars, since it relates closely to the question whether Plato himself accepts the flux theory of perception (cp. Theaetetus 157c5). The question is important because it connects with the question of whether the Revisionist or Unitarian reading of 151–187 is right.  (For more on this issue, see Cornford 1935 (49–50); Crombie 1963, II (21–22); Burnyeat 1990 (17–18); McDowell 1973 (139–140), Chappell 2005 (74–78).)