- first, the composition is planned
- then it is sketched
- the drawing is reproduced on a cardboard in normal size
- the lead-soldering lines are drawn on the cardboard:
|these delimit the shape according to which the glass pieces will be cut
|- the glasses are selected and cut
|- the lead soldering is now performed: it consists in the
|composition with lead and stucco of the glass pieces forming the glass window.