The works on perspex (acrylic glass) are all made by drawing on the reverse side (so what you see is a mirror image of what I've been working on). The perspex drawing is then mounted on or hung about 4 cm from the wall, so that the light can shine through and cast a shadow of the drawing on the wall behind.
An uprooted beech tree in a park... The tangle of roots is quite 'flat', like a giant wheel, apparently beeches do not put down deep roots.
Permanent marker on acrylic glass