Blonder, Greg2019-08-012019-08-012005-06-23Greg Blonder. "Interconvertible soft articles." U.S.Patent application 10/987,779 .10/987,779https://hdl.handle.net/2144/36930Robust, soft, interconvertible articles constructed from soft, resilient members, which articles adopt a substantially different geometry upon an interior to exterior interconversion. The articles of the invention provide a significant visual effect and are useful as educational aids, magician's props, and toys.Patent438187