A very large plastic match box, with an intriguing method of opening. At one end, there is a perspex window, through which you can see a little ball bearing. Beneath the ball bearing are a number of what look like levers or keys.

To open the match box, you have to tilt it so that the ball bearing sits on the middle lever or key, and then press down on the ball bearing. This releases the mechanism, and the match box pops open.

It contains real matches, and I guess that as well as being a neat little puzzle, it is also a handy safety feature, especially if you have small children around, and want to keep them away from the matches.