During the later 1820s, Turner began
to use of sheets of blue paper for his personal studies. The more informal
of these studies are now exhibited as individual works. However, in many
cases they were in fact created by
Turner across the surface of much
larger pieces of paper that he folded into sixteen sections. Evidence of this working practice is still discernible in these two drawings. Turner has used the same colours in each to evoke the twilight.