Full Idea
The solidity of a table is explained causally by the behaviour of the molecules of which it is composed, but the solidity is not an extra event, it is just a feature of the table. This non-event causation models the relationship of mind and brain.
Gist of Idea
There is non-event causation between mind and brain, as between a table and its solidity
Source
John Searle (The Mystery of Consciousness [1997], Ch.1)
Book Reference
Searle,John R.: 'The Mystery of Consciousness' [Granta 1997], p.7
A Reaction
He calls it 'non-event' causation, while referring to the 'behaviour of molecules'. Ask a physicist what a 'feature' is. Better to think of it as one process 'emerging' as another process at the macro-level.