Subtweeting requires a level of facility with Twitter that is beyond some novice users, but the truly mean-spirited subtweet can be a destructive force. It should be understood by teachers and parents in order to protect students if for no other reason.
Not all metaphors are generative. Some merely capitalize upon existing ways of seeing things. In the case of generative metaphor, however, there is an actual generation of new perceptions, explanations and inventions. The sense of the obviousness of what is wrong in a problematic situation, and what needs fixing, is the hallmark of a generative metaphor in Schön's sense.
In the double-pass natural technique, the coffee has had a considerable time drying with its full skin intact, on the tree. But it is laid out on the patio with the skin removed, and the darkened mucilage layer now all that is attached to the parchment shell around the green bean. How this affects the taste I am not sure. But the cup quality shouts out natural in all regards, and seems to be producing a sweet and uniform coffee in the vein of a typical dry-processed cup.
Other origins are achieving this result in a laborious hand method they can raisin coffee, where ripe cherries are picked and allowed to dry until the skin and mucilage is pruney and tough, but not a true dried pod. Then they are hand peeling the cherries, since it cannot be run through a typical pulper.