Erwin Keustermans:
9 imaginary sheets with gradations in an off-centre arrangement
Erwin Keustermans:
7 imaginary sheets, composition with non-linear gradation and mixing
Erwin Keustermans:
4 sheets of paper, the corners becoming the center.
Erwin Keustermans:
11 aligned rectangular shapes (imaginary sheets) with gradations in a bilateral symmetry
Erwin Keustermans:
17 imaginary sheets, composition with faux scribbles