but the old conception can still be felt in the passage on p. 240 of the silmarillion describing the withdrawal of the people of gondolin from all concern with the world outside after the nirnaeth arnoediad , with its air of long years passing. > in the silmarillion it is explicit that turgon devised the city to be 'a memorial of tirion upon tuna ' ( p. 125 ) , and it became 'as beautiful as a memory of elven tirion ' ( p. 240 ) .