Quirinus Puzzle

In order to solve this diabolical puzzle, you must first forget everything you already think you know about space, mass, and dimension. 16 solid puzzle pieces fit perfectly within a circular tray/frame. The challenge? Can you fit a 17th piece (the extra square piece) along with the original 16 without altering the original dimensions? Can your knowledge of geometry conquer this puzzle?
Puzzles created by Gianni A. Sarcone -- http://www.giannisarcone.com
See our new Gianni Sarcone Gallery here.