Cool effect, the 'Canary Yellow" Diamonds & Pearls Cloud Guitar as it was known then. Canary yellow was his "era/theme color" for that period, much like Purple was for 1999 through Purple Rain and Peach & Black was for the Camille/SOTT/Black Album era and powder blue was for Lovesexy, Gold for the Gold Experience era etc. etc.
A vault filled with unreleased songs from Prince has been drilled open by the company responsible for his estate.
The late singer was the only person who knew the code to the vault, which reportedly contained enough of his music to release a new album every single year for the next century, forcing the company temporarily responsible for his estate, Bremer Trust, to break into it.