Surface-I- is a first part of a composition project exploring application of mathematical theories about three and four dimensional objects and surfaces as applied to sound synthesis. Formulas for terrain mapping have been applied to “traditional” techniques of synthetic sound generation such as amplitude and frequency modulation. The “arrangement” of these sounds was based on purely æsthetic decisions, although algorithmic generation of material was very tempting. The perception of this synthetic and imaginary slandscape(*) is left up to the listener. (*) slandscape is a word created by fusing landscape with soundscape.