Entered into the design competition in Washington DC, August 2012.
This puzzle is made out of Trespa which is a pressed wood material. The top is made out of acrylic.
The object of this puzzle seems easy enough. Just remove the coin. There are metal balls that will stop you from getting the coin out. Move the metal balls to get the coin out.
Because this is a handmade puzzle, there may be imperfections. The solution of the puzzle is still the same.