Here’s something obvious that nonetheless deserves to be written. A person’s reaction to stimulus (a comment, a picture, etc.) depends in part on their mood. This is illustrated below in words with the help of a language invented especially for this purpose, so that the reader is limited in their opinion of what is said in the example.

Clock reports 10:00:00 a.m. Two test subjects sitting on a bed in a room. Girl A is contemplative. Girl B is angry. Girl A says to girl B “Ekklw rjsi bxwkjjjk.” Girl B leans back flat on the bed, sighing. Clock reports 10:00:05 a.m.

Time is reversed. Clock reports 10:00:00 a.m. Two test subjects sitting on a bed in a room. Girl A is contemplative. Girl B is sad. Girl A says to girl B “Ekklw rjsi bxwkjjjk” with same pacing, inflections and in same tone as before. Girl B cracks a smile.