C3Oは「Compound of 3 Octahedra」の略不切長方形48枚折り創作:sakuyoutube版: https://youtu.be/J8TGhXy6dNE 折り紙: mylist/16345821 twitter: https://twitter.com/sakusaku858instagram: https://www.instagram.com/sakusaku858/Flickr: https://www.flickr.com/gp/122577187@N08/f745NT