 The role of mental imagery in perception has been an important theme in the history of philosophy. We have seen the debate about the phenomenal similarities and differences between mental imagery and perception in Section 1.4. But there is an even more important question about the relation between mental imagery and perception, namely, about whether and in what sense perception depends on mental imagery. This has been a dominant theme in the history of philosophy and Immanuel Kant was probably the most explicit proponent of a fairly strong constitutive dependence claim. Kant famously claimed that imagination is “a necessary ingredient of perception itself” (Critique of Pure Reason, A120, fn. A) and this claim has become quite influential not just in philosophy (Strawson 1974, p. 54, Sellars 1978), but in the history of ideas in general. Eugène Delacroix, for example, wrote in his diary on September 1, 1859 that “Even when we look at nature, our imagination constructs the picture” (see also Briscoe 2018 and Van Leeuwen 2011 for examples of perception/mental imagery hybrid).