"Everlasting Light" is based on two contrasting hymns dealing with light. "Conditor Alme Siderum" is one of the oldest Christian hymns, whose simplicity and rhythmical flow reflect the freedom of speech. Written seven centuries later, "Wie Schon Leuchtet" is at the other end of the spectrum: measured, straightforward, and fanfare-like. The introduction intersperses dramatic flashes of light and the resulting shimmer (via the echo technique) with phrases of the chant. The chant is treated in its entirety at measure 19, and then antiphonally at measure 27 with its inversion (light reflected). The German chorale is heard at measure 40, and again in augmentation at measure 62 layered over the chant, each phrase of which is echoed (reflected) an octave lower. The piece ends with a return to the opening flashes of light, this time the "shimmering" sixteenth-notes being more pronounced. Set in the keys Eb Major and C Major, measures total 79.