Mirror with T-shaped design, China, Warring States period, 475-221 BC), bronze - Hong Kong Museum of Art, Hong Kong. This artwork is in the public domain because the artist died more than 70 years ago. Note: although the museum did not permit photography of most items in the museum, it explicitly permitted photography of this particular object (both in signage and when I asked a guard). Thus there are no restrictions on use of this image.