“Phänomenologisch orientierte Fotoanalyse – ‘Schmieren‘ [Phenomenologically oriented photo analysis – “smearing”, the start of the children’s drawings], der weitgehend unerforschte Beginn der Kinderzeichnung,” Georg Peez, Photographs in educational case studies, Munich ( Kopaed Verlag ) 2006. The author explains [in German, but auto-translated here]:
” instead of the proposed by Hans-Günther Richter traditional method, the research on the “smearing” product and result-oriented align, ie “fingerprints on windows and furniture surfaces, spinach stains and their motor-tactile changes Breispuren or similar document” (Richter 5 1997, p 24), is in the present investigation exploring the processual nature of greasing in the foreground. The activity of greasing is investigated qualitatively and empirically using the example of a 9 1/2 month old girl.”
Here’s detail from the study:
A Heise news report further explains [also in German, also here auto-translated]:
“Children make the same movements as the touch screen user when they explore a porridge, a Frankfurt scientists has observed”