 One can raise the core challenge to Sufficiency in other ways. Another source of examples can be found in Block’s (2007) empirically informed work on “phenomenal overflow” (drawing on Sperling 1960 and Lamme 2003). Consider for example the Sperling paradigm, in which subjects are flashed a grid of letters, and only subsequently given a tone that indicates which row to report (high for the top, medium for the middle, etc). Subjects are able to report any row singled out without being able to report them all. (For an online demo without sound, see  Other Internet Resources).  Arguably subjects experience all the letters as they are without being able to report them all (but see Stazicker 2011 or Phillips 2011 for criticisms of Block, also Odegaard et al 2018). The objector may add that we do not have justification from our experience to believe the proposition that enumerates all the letters present. (For a further way to set up the speckled hen problem, using the example of highly determinate colors, see Smithies 2019: ch. 11).