The tall, stained glass window at the back of the chapel is the World Christian Fellowship Window. Twenty feet high and eight feet wide, with over 9,000 pieces of glass, it was created by the D'Ascenzo Studios in Philadelphia, Pennsylvania. The window commemorates the presence of the Holy Spirit in the original upper room twenty centuries ago. But more than that event, the window depicts the work of servants of Christ who have been empowered by the Holy Spirit down through the centuries since Pentecost.
The World Christian Fellowship Window was dedicated on Pentecost Sunday, May 17, 1959, six years after the opening of The Upper Room® Chapel.