in Kassel, Germany. Rickey's sculptures can now be seen in major museums in the US and in most European capitals, Japan, and New Zealand. His work is often compared to the mobiles of Alexander Calder, but while Calder used organic, playful forms, Rickey's European lineage is more closely related to the Constructivist principles of geometric engineering. In 1967, he wrote Constructivism – origins and evolution, published by George Braziller, Inc., New York. In works such as Two Open Triangles Up Gyratory, Rickey's two wind driven elements (engineered to withstand winds of ) provide an endless series of combined, almost dance like, shapes and movements. Rickey mastered not only ordered predictable movements, but also mastered methods of controlling both the speed and tempo of similar objects to respond more randomly, such as in his work Four Open Rectangles Diagonal Jointed Gyratory V. Much of his work was created in his studio in East Chatham, New York, where he moved after taking a position as a professor of art (sculpture) at Rensselaer Polytechnic Institute in Troy, New York. His kinetic sculpture titled Two Rectangles, Vertical Gyratory Up, Variation III was a central element of the Rensselaer campus from 1972. It is now located in Zurich, Switzerland, at the headquarters of UBS. This sculpture was known as the Crinatoid when it was located on the Rensselaer campus on long term loan. It was removed after Rickey and Rensselaer could not agree on a purchase price. Rickey also lived and worked in Berlin for many years, following the Documenta III art show. His studio time was spent constructing sculpture and preparing for exhibitions in Europe. In Rickey's words the city was like a "cocoon" in the middle of communist East Germany, with a lively and advanced social and cultural life which he partook in fully. During this time he received numerous Honorary Doctor of Fine Arts degrees. In 1979 he had a retrospective at the Guggenheim Museum in New York City. Rickey's sculptures are on permanent exhibition at the National Gallery of Art, and the Hirshhorn Museum in Washington, D.C., the Governor Nelson A. Rockefeller Empire State Plaza Art Collection in Albany, New York, the San Diego Museum of Art, The Delaware Art Museum, The Indiana University Art Museum, the Honolulu Museum of Art, Frederik Meijer Gardens & Sculpture Park, and at the Laumeier Sculpture Park in St. Louis, The Hyde Collection in Glens