The hooloovoo is a super-intelligent shade of the colour blue. One was seen as a prism for Zaphod Beeblebrox's address upon stealing the Heart of Gold. On certain special occasions, such as the aforementioned Beeblebrox address, they will be refracted into a free-standing prism.

The hooloovoo demonstrate their dissatisfaction with the Universe by holding their breath until they turn a deep purple.


The hooloovoo appeared in:

Cultural referencesEdit

One of their race is pointed out by The Doctor in the 2013 Doctor Who episode "The Rings of Akhaten".

In Season 3 of King of the Nerds the blue team named themselves "House Hooloovoo"

There is a software company Hooloovoo from Belgrade, Serbia, who used this and many references from the book to attract software developers with similar sense of humor.