not very Frequent Bionicle Facts on Twitter: "Christian faber, the lead concept artist for bionicle has shared video recordings dating back to 1999 of really early bionicle prototypes, known as "voodoo heads"
Did Bionicle save Lego? - Quora
What purpose does the "Voodoo Ball" serve? : r/bioniclelego
The Turaga Files - exhibit 23: VooDoo heads, Bionicle's prototype line : r/bioniclelego