Grimm's Leonardo da Vinci Building SticksThe ingenious constructions of Leonardo da Vinci: with these sticks one can create a dome and a bridge, which stand without glue or a cord and without a nail or a screw! Admittedly, one needs a quiet hand and some finesse to set it up. Instructions for dome and bridge included. The beauty of it is, that you can start with one or two modules, which can then be extended step by step to become a larger bridge or dome. By building and playing with these