What type of bass line is used in time lapse by Michael Nyman?

The bass line in "Time Lapse" by Michael Nyman is an example of a walking bass line. A walking bass line is a bass line that moves continuously, typically using eighth or quarter notes, to provide a sense of movement and momentum to the music. In "Time Lapse", the walking bass line is played on a double bass and provides the main harmonic foundation for the piece, supporting the melody and chords played by the other instruments.