Windows on the Holy Mystery
"The screen itself was both a barrier and no barrier. It was not a wall but rather a set of windows, a frame for the liturgical drama, solid only to waist-height, pierced by a door wide enough for ministers and choir to pass through and which the laity themselves might penetrate on certain occasions... This penetration was a two-way process: if the laity sometimes passed through the screen to the mystery, the mystery sometimes moved out to meet them."
- Eamon Duffy
The altar at St Birinus' is seen through the beautifully gilded Rood screen.