“…If both r and s are present, then, in most cases of communication, including perception and testimony, s ≠ r. This simply means that the data come from a source interacting with the agent (the photons coming from the yellow light), but they are not about the source (the photons are not "about" the yellow light), which is not their referent, not least because they are the outcome of the cognitive interactions and negotiations between agent and the data source, although we shall see that there is a plausible sense in which ordinary perception works correctly when it interprets s = r. If s = r, testimony becomes an unusual case of self-confession. Francis Bacon was perhaps the first to rely on this feature in order to speak metaphorically of the scientific inquiry as a questioning procedure addressed to Nature, an informational interpretation of the logic of discovery that we consider rather common nowadays (Sintonen 1990). However, even conceding that all this, including the praxical solution of the SGP, is correct, it still falls short of providing a full account of Alice's perception of the yellow light flashing as indicating that the dishwasher is running out of salt.…”