It has the shape of a "lid", but it won't open as it is. Well, to be precise, it doesn't open like a "lid". In fact, you can open it easily by using a table. But please don't hit it. If you concentrate, you should be able to open it even on the palm of your hand.
It is based on Kamei's COSMOX (M-17). This is a slightly more luxurious version of Small Box 5 (KK-5) with different sizes, materials, patterns, etc. The mechanism uses metal balls, but I made them out of stainless steel. Oops, will the mechanism be revealed?