"When you cover the lid, you can open the box. But when you take off the lid, you can close the box." This is a paradox. But I wanted to realize this paradox. Even if you are confident that you can solve all puzzles by yourself, you can't open this box without a stroke of genius. But if something flashes in your mind, you can open it easily. Even little children can open it. In this box, all of your experiences get in the way and aren't useful. Try to find the solution.
Shipping: £10 in the UK; £20 in the EU; £30 Rest of world.