05:50 min, 16:9, stereo, 2011
In OSA the surface is the skin of a male subject under test as shown in blue since harmless.
Sound / sound waves are words which we put in two categories. Category 1 in red for precarious words , category 2 in blue for rather inoffensive words.
Emission means words that do not penetrate into the male subject what may have positive as well as negative consequences.