As a captain of a ship my grandfather used instruments like Octant to navigate on the sea by searching for certain constellations.
For him I enlarged this instrument to a bookshelf with 3 shelfs which move independent by the weight of the books.
True time Octant wil take different possitions in your living environment.
Material: Steel oiled, Plato Frake
Size: 2700-3200 x 2200 x 540 mm