With the revolutionary concept - for Britain, at least - of seating diners at communal tables, the Japanese noodle house was an instant hit.
Times, Sunday Times (2008)
This is because these aren't just ideas, they're revolutionary concepts, and therefore difficult to understand.
Times, Sunday Times (2006)
The key to his revolutionary concept was a ship that had a keel only at the stern, rather than running the length of the boat.
THE FROZEN WATER TRADE (2002)