Collectible for their combined historical and practical value. Ship's hourglasses were calibrated to the half hours of the ship's clock. To honor the important symbolism of the hourglass, Renaissance artists painted still lifes, also called vanitas, full of symbolism and morality. Colour: bronze, brown, black Material: mango wood, metal and glass Dimensions: LxWxH: 18.5 x 13 x 25.5 cm