Ooh, neat. Building upon the question of circles then, is it possible to work with a projection of a circle (in shadow or light), or even something more esoteric like arranging loose objects to form it? Or must they absolutely be etched and/or drawn somehow? A character recently raised the question of whether one could project the image of a circle on to a wall to make it bigger so as not to have to go through the effort of drawing something immense.

Also because I keep getting asked: it's not possible to use alchemy to do reverse transformations right? E.g. Glass into sand?