This digital book sets out the results of the research on which the printed booklet Glory in Glass, published in 2012, is based. It goes well beyond the scope of that booklet, which is intended to be a brief and accessible introduction for visitors to the Cathedral. A supplement, Looking Through Glass, published in the same year, is more comprehensive. It includes three windows not normally visible from the body of the Cathedral, i.e. two in the bell tower and one in the Chapel of the Resurrection. It seeks to interpret the windows as well as describe them.

The text of Looking Through Glass has been used in this digital book, with just a few minor amendments.

One benefit a digital production has over a printed one is that colour illustrations are viewed on a back-lit screen, allowing more contrast and brightness than possible in a paper book. This improved clarity suggested the title Through a Glass … Brightly, a somewhat whimsical reference to St Paul’s comment on the difficulty of clearly understanding the nature of God ‘For now we see through a glass, darkly’ (1 Corinthians 13:12).