It's an oval-shaped stadium with a track and field and partial, fixed roof. The track and field had taiko drums and kanto paper lantern poles on both ends.

File information
Filename:	ol393-20191221_6368p.jpg
Album name:	philbert / Olympic Stadium - Hello, Our Stadium 国立競技場
Keywords:	tokyo / shinjuku / olympic / national / stadium
Filesize:	53 KiB
Date added:	Jan 04, 2020
Dimensions:	700 x 312 pixels
Displayed:	24 times
URL:	https://photoguide.jp/pix/displayimage.php?pid=69331
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The seats have a random mosaic design in shades of green,