THINGS do not all appear as they actually are. We have already seen an instance of this in a straight lead pencil appearing bent by re- fraction, and also when things are rapidly whirled round what a changed appearance they have. These are, however, satisfactorily accounted for ; but there are… … if the sheet is held up, and the eye directed along the line from B to A, it will be seen to be quite straight, or it can be tried by a rule or straight edge. Take another illusion. Here the long lines seem to
Light · Color · Optical illusions · Optics
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
