The original idea for this design was from a father of a friend, he gave me this little box and asked me how he put the object inside it, after few minuets trying to get it out, I gave up. Than he told me: It was never been outside.
He originally laser cut it from a metal cube, but I've decided to model it, and add a little hole for key chain.
It's fun giving it to people and asking them "How did I put the object inside the cube?" and watch them struggle for few minutes.