Metrological analysis of the evolution of a 3D surface in a 4th dimension is now possible using the new 4D software module in Mountains Technology version 5 from Digital Surf. Integrated by leading manufacturers of 2D and 3D instruments for the analysis of surface texture, the software delivers topographical analysis of micro and nanosurfaces. The 4D module opens up new horizons, and is compatible with any 3D instrument. Changes in height on the z axis are now not only a function of the x, y position but also of a 4th dimension t, which is most often time but can equally well be temperature, pressure, magnetic field or any other physical constraint applied to an object or surface for the purpose of studying its reaction.