Erwin Keustermans:
3 types of pen and brush scribbling, aligned, with pencil sweeping in the background, small version
Erwin Keustermans:
3 types of scribbling ordered, medium sized
Erwin Keustermans:
pushing and dragging with pen and brush, additional sweeping at the edges.
Erwin Keustermans:
three types of scribbling, medium size, pen scribbling, pencil sweeping.
Erwin Keustermans:
pushing 'n dragging
Erwin Keustermans:
additive pattern, rows of decreasing cells
Erwin Keustermans:
Sawtooth, flintstone, pebbles.