Robert’s “Seal Upon Thine Heart” series is conceived like a Goldberg Variations, but instead of inventing a number of increasingly delightful changes upon a repeating melody, as Bach does, Robert invents changes on a repeating set of visual elements. The elements begin with a landscape and with the faces of a woman and a man, who may be looking at one another or away from one another, and whose features are lighted in different ways. Here the woman’s face is in direct light, while the man’s face is in shadow. A visual pun treats the sunflowers as the source of light, brightening the face that looks toward them and shadowing the face that turns away. The delicacy of the flowers is contrasted with the heavy areas of black. Flowers are a gift of love that awaken our senses. Here they are treated as a screen, providing privacy and secrecy to the lovers.