What's this interesting round thing? It's a Christmas tree skirt. A piece of fabric you use to cover the tree stand/base of the tree. It's made in 2 layers, a bottom blue layer and white top which is decorated with various classic stock arts. The dollar bill there shows you the size. This is definetely from Japan, but is it official? Certainly it looks like something a fan could make with iron-on-art...but it's also super uncommon (despite being claimed as a classic, it didn't turn up till 2010) so it's extremely difficult to prove. Christmas Sonic ornaments WERE officially produced so it's not a stretch to think they could have had a real tree skirt too. Very interesting to see!