Creating the illusion of softness in rigid metal is a hallmark of skilled sculptors. To achieve smooth gradients on hard edges, artists employ a meticulous multi-step process.

Filing is the first critical stage, where coarse rasps remove bulk material while finer files refine the shape. Diamond-coated files are particularly effective for hard metals like steel or bronze.

Next, sanding with progressively finer grits (from 80 to 2000+) transforms rough surfaces. Wet sanding with lubricants prevents clogging and allows for ultra-smooth finishes.

For mirror-like transitions, polishing compounds paired with rotary tools or buffing wheels work magic. Tripoli and rouge compounds, when applied with felt wheels, can create seamless blends between planes.

Some sculptors use specialized techniques like:

- Heat blending with torches to slightly soften edges

- Electrochemical polishing for uniform surface refinement

- Micro-abrasive blasting for controlled texture gradation

The final secret lies in light manipulation. By carefully angling facets and controlling surface reflectivity, sculptors trick the eye into perceiving softer transitions than physically exist in the metal. This optical illusion, combined with physical refinement, creates the breathtaking fluidity found in master metalworks.

Advanced practitioners often develop signature methods, sometimes combining traditional metalworking with modern technologies like laser texturing or CNC-assisted finishing to push the boundaries of metallic softness in sculpture.