This is a computer piece I did in 1977 at the Institute for Sonology, then in Utrecht, now in The Hague.
It is the result of direct real-time synthesis on a DEC-PDP 15 by means of a program I had written in assembly language.
The form can be described as a canonical introduction, followed by variations and a theme.
The name is a reference to the biggest prehistoric megalithic stone grave in the Netherlands.