Interesting that Vai and Ibanez invented the 7 string guitar. Except that a 7 string guitar evolved in Russia in the late 1700's and was widely played and composed for and another one emerged in Brazil in the mid 19th century with similar appeal. Still Vaibanez came up with the 24 fretter, er..., except that Brian May and his Dad built the Red Special in 1963 and in '73 Gibson had the L6s in full production.
Anyway V & I are working on a new invention for next year, apparently called "the Wheel", looking forward to checking it out.