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The large mosaic in the crossing, which is now hidden from view by a wooden podium, was completed in May 1891. The theme of this mosaic is the cosmos. The sun is depicted at the centre of the mosaic and is surrounded by personifications of the times of day, portrayals of the phases of the moon, and a ring of zodiac signs in small round medallions. Personifications of the four cardinal points and their corresponding winds as well as four expressive faces depicting the four humours can be seen in the corners of the square area at the centre of the mosaic. The four elements (fire, water, earth, and air) also feature as crowned youths in small squares.