paintings were done before the mature representational style emerged.
They are organized similarly to the later paintings but lack the
details and usually contain no staircases or porches done in the later
style. The 1932 painting of a staircase may have been the first one he
paintings exemplify Mark's mature style and often include stairs and
porches or other elements that convey similar diagonal or horizontal
motion. The treatment of trees, bushes, and distant vistas is detailed
and characteristically precise.
did these paintings in the studio rather than outdoors. They reveal his
growing dissatisfaction with representational painting, but are
themselves still largely representational. They are abstract rather
than non-objective and contain elements of his representational
Mark finally discovered a style based on repeated identical units in
1958, he began producing paintings with no representational elements.
These paintings were from the first expressions of emotional and
spiritual themes. The units were originally derived from stairs and
banisters, but evolved over the next few years into the form of the
final unit, which remained unchanged from 1967 until he ceased painting
in 1996. The evolution of the units may be seen in the folder called
paintings were done with the final unit and are organized as a
hierarchy of units and filled-in clusters of units in a relatively flat
space. At the beginning of this period, in about 1968, Mark switched
from oil paints to acrylic paints, first painting backgrounds with
acrylics and then painting the units with acrylics also. Early in this
period, he completed some extremely large canvases, up to 100 inches in
one dimension, but then returned to smaller canvases, usually 50 to 70
inches in each dimension.
1976 onwards, the units are organized into more varied shapes that
relate to one another in compositions that are more fluid and
incorporate more tonal and color variation. The movements are modulated
by subtle tonal and color relations that also lend depth to the space.