Contribute correction: Sphere Redux (unreleased)

  ______   _    _    _    _    _    _   
 /_   _// | || | || | |  | || | || | || 
 `-| |,-  | || | || | |/\| || | || | || 
   | ||   | \\_/ || |  /\  || | \\_/ || 
   |_||    \____//  |_// \_||  \____//  
   `-`'     `---`   `-`   `-`   `---`