Borrowed light
Daylight carried deeper into a plan than it would naturally reach — bounced off pale matt surfaces, thrown by a mirror, or passed from one room into a darker one through internal glass. The most powerful Extend move, since a bright room reads as larger.
Make the light travel
Daylight falls off with the square of the distance, so the back of a deep room is dark. A mirror opposite the window nearly doubles its reach; a glazed transom lights a windowless interior room.