Tangle, Inc v. Aritzia, Inc.: Copyrightability of Kinetic and Manipulable Sculptures

In the United States, copyright protection is afforded to original works of authorship that are fixed in a tangible medium of expression. But what does it mean for something to be “fixed”? Must it be motionless? In the case of sculpture, can it be “fixed” if it can take on different poses? Here, Tangle, Inc.