46a. William Blake, Experience title plates of Songs of Innocence and of Experience copies F (top) and T1 (bottom). Yale Center for British Art, Paul Mellon Collection (copy F) and National Gallery of Canada, Ottawa (copy T1). Details of pillars and figures in the two impressions, showing that they share the same pattern of printed colors around the date. This pattern is an accidental feature indicating that the two impressions were printed in the same session. The white escarpments, visible in the copy F impression, were painted over in the copy T1 impression in the same gray color used to paint out the date.