The legs are not missing. This chair is complete as intended. Chairs like this are moderately common and are used at traditional low tables.

Camera model		Nexus 5X
Shutter speed		1/24
Aperture		f/2.0
Exposure bias		0.00
Exposure		Not defined
Exposure index		0.0
Focal length		4.67,mm
Distance		0.00 m
Light source		Unknown
Flash		Off
Metering		Unknown
ISO sensitivity		229
Latitude		34.489928˚ N
Longitude		133.39721˚ E
Altitude		57.00 m
Location		Fukuyama, Hiroshima, Japan