I say let's go with TWO! As in "ANAMORPHIC DUO-VISION"! Check it out in "Wicked Wicked" playing (early) tomorrow on TCM:
According to the TCM site, "Duo-vision" was incorporated into this film because "...it lends itself to showing truth and untruth, flashbacks in time, visions of the future or cause and effect without abrupt interruption..."
I don't know about that, but Tiffany Bolling's singing of the title song has me hooked. Fun Fact: Tiffany was simultaneously starring in "The Candy Snatchers" at the same time! Wonder if that one will show up on TCM in the future?