The Star of Bethlehem, Edward Burne-Jones
On Google Art Project, high res downloadable file on Wikimedia Commons, original is in the Birmingham Museum and Art Gallery.
Watercolor and bodycolor on ten sheets of paper, on stretcher, 101 × 152 in (260 cm × 390 cm), or roughly 8 ft x 12 ft.
Based on his original design for a tapestry, Pre-Raphaelite painter Burne-Jones revisited his interpretation of the Adoration of the Magi in what was the largest watercolor of the 19th century.
There is an article with background on the painting on Wikipedia.
