The property of being intentional, of having an intentional object, was the key feature to distinguish mental phenomena and physical phenomena, because physical phenomena lack intentionality altogether.

The property of being intentional, of having an intentional object, was the key feature to distinguish psychological phenomena and physical phenomena, because, as Brentano defined it, physical phenomena lacked the ability to generate original intentionality, and could only facilitate an intentional relationship in a second-hand manner, which he labeled derived intentionality.

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