Contribute correction: Sphere Redux (unreleased)

  ____       ___      _____      ___    
 |  _ \\    / _ \\   /  ___||   / _ \\  
 | |_| ||  / //\ \\ | // __    / //\ \\ 
 | .  //  |  ___  ||| \\_\ || |  ___  ||
 |_|\_\\  |_||  |_|| \____//  |_||  |_||
 `-` --`  `-`   `-`   `---`   `-`   `-`