A tip of a copper wire is submerged in a handblown glass vessel containing a bath of electro-forming solution (a combination of copper sulfate, sodium chloride, and sulphuric acid). When electricity runs through, a copper cluster grows on the tip of the copper wire in a fractal pattern. The electroforming solution needs constant stirring for the process to work. A glass propeller is programmed to stir only when observers are nearby.
