Other examples are huge rings, over 2-meters-diameter, like the one in this photo, made from braided reeds called chinowa and decorated with shide (the Shinto strips of zigzag paper). These are raised twice a year at the entrance to the shrines and by passing through them, the visitors receive purification and protection against misfortune.
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 18mm
Aperture: F/5.6
Shutter Speed: 1/60s
ISO Sensitivity: ISO 200