Halliday & Matthiessen (1999: 210):
Qualities of projection are all scalar and they are […] agnate with processes of sensing in figures of sensing; they are often realised by participial verb forms used as adjectives. The thing they are assigned to, as Attribute or as Epithet, is agnate either with the Senser (the ‘like’ type …) or with the Phenomenon (the ‘please’ type …). From this it follows that when they are agnate with the Senser, they are ascribed to conscious beings …, whereas when they are agnate with the Phenomenon, they can be ascribed not only to things but also to metathings, ie projections …