The part of the tongue required to approach the palate for the vowel [ i] is deeply retracted in [ǃ], as it lies at the bottom of the air pocket used to create the vacuum required for click airstream. This makes the transition required for [ǃi] much more complex and the timing more difficult than the shallower and more forward tongue position of the palatal clicks. Consequently, [ǃi] takes 50 ms longer to pronounce than [ǂi], the same amount of time required to pronounce [ǃəi].