The harmonizing south apse window depicts the four Evangelists, Matthew, Mark, Luke, and John. In the pinnacle of this window appears the figure of St. Paul. Set in the footpace before the altar is a memorial containing stones brought from St. John's Chapel at Glastonbury, England, and from St. Columba's Monastery on the Island of Iona in the Scottish Hebrides. When celebrating Holy Communion, the priest stands upon these symbols of the traditional origins of ancient British Christianity, thus forming a link with out Anglican or Mother Church. The floor of the sanctuary and chancel is a beautiful mosaic.
Legend has it that there is a hidden picture of a fish in the floor.
This must be a predecessor to the current magic pictures On the Epistle side of the chancel is an organ originally installed in 1902 and rebuilt in 1936 and 1966, and again extensively refurbished in 1988. St. John's has the richest musical heritage dating back to its first rector, who is said to have organized the first boy's choir in Detroit. There was originally a tubular carillon in the bell tower, but now there is an electronic carillon, and the disposition of the original is a mystery to many. Click here for more information on the organ. The font of the baptistry , located on the south aisle, is of Caen stone and was the gift of the Sunday School children of 1861.