Astro Acrobats: The Stacking Spacemen - Inspired by the original "Bill Ding" Astro Acrobats: The Stacking Spacemen (Inspired By the Original Bill Ding). These balancing spacemen are out of this world! Perform amazing astro-stunts with this set of nine 3 3/4" wooden spacemen. Great gift idea, presented in gift box as pictured.