Awesome lightning created by high voltage from the microwave power supply. It is impossible to predict what the drawing will turn out to be, it is always different.
The whole principle of operation of this method of burning is based on the fact that a surface impregnated with an electrolyte conducts an electric current through itself (which is accompanied by carbonization of a tree). The main thing when working with high voltage is not to forget about safety measures.
Some masters fill the "lightning" with a luminescent composition, accumulating light from any source, making the burnt grooves glow beautifully in the dark.