 To achieve the effect in which water appears to be flowing from subjects ' mouths , each video has a segment where the subject 's lips are <unk> , which is then timed to correspond to the spouting water , reminiscent of <unk> fountains . Each face is cropped so that no hair and usually no ears are visible . Since there is no tripod designed for cameras turned on their sides , an <unk> barber / dentist 's chair was used to minimize the need for the movement of the state @-@ of @-@ the @-@ art camera during filming . Nonetheless , in some case , digital manipulation was necessary to properly simulate puckering in the exact proper location on the video . Many of the faces had to be stretched in order to get the mouths properly positioned . Additionally , each video was color @-@ corrected for brightness , contrast and color <unk> . Both the playback equipment and the final videos had to be further adjusted to account for sunlight during viewing . 
