And from there, either lexicographical or morphological inquiries of the text can be pursued. The crisis comes once the boundaries between the first four and the fifth are made clear. The eidolon, or 'image' refers to any representation of a circle, whether drawn on paper, or lathe from wood. These material representations of a circle, however, undergo decay, and destruction. The eidolon suffers destruction because of its materiality.
Language is also material in that it is subject to change and decline.
Furthermore, language itself conflates appearance with reality. Therefore the knoweldge of the knower should be directed at the essence of the thing and trained not to be fooled by either the image or the language. To find out what it is and to see an example, click THIS .