1970-1980—Creation Series The Creation Series marked departures in previous painting styles. During this period, he was sculpting simultaneously while painting. Similar to the Babcock disapproving of his evolving away from genres they preferred, years earlier
John Canaday the art critic voiced similar frustration is several of his reviews of Robert's works. The issue of being pigeon-holed irked Robert and the dictum that one could only be defined as a painter for one style was not acceptable to him. Continuing to venture into new genres, he created during the early seventies “slide triptychs” where each panel of a painting would represent a greater magnification of his subject. In the egg and slide triptychs, the preliminary studies or smaller works would contain more depth of detail then the larger final works. The smaller water colors completed his output during this period. These significant changes in the direction of his work in terms of his paintings and his new direction into sculpting caused Robert's falling out with the Babcock Galleries—they would not show his sculpture because he was associated with their gallery as a painter and they wouldn't show the new creation paintings because these were too different from the mystical, moody abstractions and landscapes he was known for. Although he missed exhibiting, separating from the Babcock Galleries freed him from producing with exhibitions and sales in mind and coincided with a new direction in his work, one that proved ultimately more introspection and brought him great personal satisfaction. A counterbalance to reduced exhibiting was the ability to work as he wished.
1975-1985—Sculpture During this period, Robert began sculpting (stone carving, mostly marble) and also painting what he later termed Egg Paintings, which became part of his Creation Series of paintings.
1990-2000—Waterscapes These waterscapes show a marked departure in style and content from the waterscapes during the 1940-1960 period. Gardens and natural parks like the Everglades were subject matters and numerous photographs from 1990-2010 Photographic Studies for Paintings were used to plan these works.
1980-1990—Wilderness Series The charcoal drawings, flower paintings and close-ups of bodies of water and plants are his latest works and have never been exhibited. At least twenty of these paintings were sold from his studio to private collectors. Robert concentrated the latter part of his life on producing works rather than exhibiting. His painting subjects came from the national parks and gardens he visited, and he approached these works as portraits rather than landscapes. The water paintings and paintings of grasses were his personal favorites—he liked best what seemed chaotic or unorganized and then finding reason, patterns and rhythms, from a scene viewed at a park or garden. The charcoal drawings would become the “Wilderness Series” and the themes and forms of these drawings found their way into the paintings. Robert would use turpentine to wet the paper and with a palette knife would then work with this wet medium, creating the image from the black liquid mass. (This technique was borne from an accident when he had spilled turpentine on a charcoal drawing he had been working on.) Once it dried, he would create the drawing by erasing light out of the charcoal mass. Attention to the negative spaces in a composition was a favorite theme in all of his works across media. File:Wild1.jpg|
Wildernes No. 5 File:Wild2.jpg|
Wildernes No. 11 File:Wild3.jpg|
Wildernes No. 3 2000-2010—Flower Portraits He read Blake's Auguries of Innocence and felt this poem best expressed his world view, to see heaven in a wildflower. The flowers and waterscapes from the second half of his career become more representational and are from the most prosaic locations (local gardens, first in New York then Florida). Robert took great delight when viewers of his work were surprised that the subject matter was a subway ride away or around the corner. The ability to go back and see a subject he was painting at different times in different lights and also, to see the flowers and plants go through death and come alive again in the next year enchanted him. For his entire life, Robert had been an inveterate traveler. As the physical aspects of travel became too laborious, his pragmatism refocused him in his immediate surroundings for subject matter. File:Bougainvillea1.jpg|
Bougainvillea 1990-2010—Photographs These photographic studies were used to plan the later waterscapes File:Coast12.jpg|
coast12 File:Water lilies.jpg|
water lilies == Influences ==