Visitors to York Minster will be able to see part of the Great East Window in an "orb" (left) from next Saturday.
The 311-panel window, described as the stained-glass equivalent of Michelangelo's Sistine Chapel ceiling, is being restored.
Panels that have been restored are being displayed in a gallery created inside a futuristic metallic "orb" inside the church. It displays five panels; four are on permanent display while the fifth will change each month during the three-year restoration. The window, completed in 1408, was created by John Thornton and cost £56, around £300, 000 today.
Mr Thornton received a £10 bonus for his work.