Painting with iPhone screen light on photographic paper.
Archival fibre-based paper mounted on MDF, each 40 cm x 50 cm, unique.

http://martawlusek.com/files/gimgs/th-50_2_v9.jpg
http://martawlusek.com/files/gimgs/th-50_1_v3.jpg
http://martawlusek.com/files/gimgs/th-50_3_v7.jpg