Sandblasting is about blown sand and stencil. Most of the time stencils are affixed to the glass, that is the standard method used by almost all sandblasters. This “restriction” is what gives the medium it’s recognizably distinctive look of ultra sharp edges and soft gradations between things. It wasn’t long after I started etching before I was, in some circumstances, wanting to break free of that. I believe that for most sandblast artists who encounter that urge to go beyond the standard look logically attempt “freehand’ techniques to bridge that gap between sharp and soft edges.