Full-size plastic model of a space probe of extraterrestrial origin. Part of an exhibit I designed for the Life in the Universe hall at the National Air And Space Museum. (The other part of the exhibit can be seen on page 199 of a book titled "The Smithsonian Experience", in a photo called "Message pod from a space creature". I'm working on getting a good photo of that to upload.) The flat red & grey disk is about two feet across, and was designed to rotate (though it was not displayed rotating).
I did all the design and construction work myself, with assistance from Jack Hawley (who was my boss at the time, so I was his assistant in his job, which was Inventor For Hire). The larger pieces were vacuformed, plug molded, or machined; many smaller ones were stamped out with a punch press and dies. It was very nice to have all the resources of Jack's electronic and mechanical prototyping shop available. I miss that.