Square mirror with birds, beasts, and flowers

Maker unknown · Cast bronze (copper 70%, tin 25%, lead 5%) · Undated in the Imperial Household Agency record · Shōsō-in Treasures, South Section 70

Find the lion-shaped knob at the centre, then count the six lion-like beasts around it. The mirror is only 17.1 centimetres square, yet it weighs about 1.9 kilograms.