At the
bottom centre of the image are two visual elements - the series
of rails creates a line that curves off to the left - while
at the right of this is a series of points that the eye connects
through continuity to form another line.
The eye
wants to follow both lines in different directions where they
divide. At the top of the image is another solid line that leads
off to the left.
All of these are
examples of continuity.