Halliday & Matthiessen (1999: 209-10):
Qualities can be distinguished according to the transphenomenal types of projection and expansion. Qualities of projection and qualities of expansion differ in a number of respects. Most fundamentally, they differ in their patterns of agnation. Qualities of projection are agnate with processes of sensing in figures of sensing; … In contrast qualities of expansion display patterns of agnation within being & having, with variation according to subtype. This fundamental difference explains other differences; for example, qualities of projection tend to occur in agnate pairs of the ‘like’ and ‘please’ type that we find with figures of sensing (e.g. afraid/scary, suspicious/suspect, bored/boring), whereas qualities of expansion do not.