The Kiss sculpture was carved out of limestone with the core function of expressing the subject of the sculpture in the purest form. It depicts two persons kissing. They are so close together that they merge into a single form. With the method of direct carving, which became popular in France at that time due to the interest in "primitive" methods, Constantin Brâncuși created contours that outline male and female forms. The tall stone block is vertically separated in the middle, and the woman differs from the man by her rounded breasts and long hair falling down her back. The shapes are joined: the arms of the pair are straightened to fit into the block itself, and the two oblique lines are joined into one arc. There is a deliberate bulge on one of the subjects to suggest breasts. Two eyes, each half-visible in profile, make one cyclopean, almond-shaped eye. Their mouths are connected, which indicates the closeness and mutual protection of men and women. Hairlines sweep into a continuous arch, and arms join to encircle the cubic block. However, clear structures can be discerned, such as the separation of the body, arms, hair, eyes. There is a feeling that the two of them will never separate again and they want to stay together forever.
Composition, texture, and material of sculpture Kiss emphasize Constantin Brâncuși's fascination with the forms and spirituality of African, Assyrian, and Egyptian art, and perhaps with the cubist works of his contemporaries. The juxtaposition of smooth and rough surfaces on the sculpture paired with a dramatic simplification of human figures, shown from the waist up, may indicate Brâncuși's awareness of "primitive" African sculpture. Reductions in sculpture suggest a new awareness of Cubist sculpture, as well as a debt to the primitivist carvings of Paul Gauguin or André Derain. This does not mean Brâncuși is making abstract sculptures. He said about this: "They are imbeciles who call my work abstract. That which they call abstract is the most realistic, because what is real is not the exterior but the idea, the essence of things."