It's a giant disco ball skeleton! The Halloween decoration is ready for Studio 54. Last year, YouTuber Ali Spagnola created the 12foot work of art from scratch using 500,000 mirror tiles. It took 70 hours of labor, of the course of several days, to complete. Spagnola, who has more than 2 million followers on YouTube, is known for her creative DIY projects. This year, she made a skeleton that glows in the dark.