What always fascinates me, is the ability to have a vague idea of a sculpture in mind, then constructing it, developing it, then observing it further, to include chance and possibly intervene to finally execute the art work technically.
There are no drawings, no little sketches; I prefer to go the more contemplative and time-consuming way of building a paper model.
The advantage is that I am in the three-dimensionality from the start and thus can fathom focal point, mass and proportion as well weight distribution. Another advantage is that a model can be scaled which means it can be executed in different sizes, paying justice to proportion. These paper surfaces I use later as templates for the sheet metal pre-cuts, which I draw by AutoCAD before having them cut them by laser or water jet.