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. 'invisible'.
Relative terms which imply number or potency, therefore, are all
relative because their very essence includes in its nature a reference
to something else, not because something else involves a reference
to it; but (3) that which is measurable or knowable or thinkable is
called relative because something else involves a reference to it. For
'that which is thinkable' implies that the thought of it is
possible, but the thought is not relative to 'that of which it is
the thought'; for we should then have said the same thing twice.
Similarly sight is the sight of something, not 'of that of which it is
the sight' (though of course it is true to say this); in fact it is
relative to colour or to something else of the sort. But according
to the other way of speaking the same thing would be said
twice,-'the sight is of that of which it is.'
Things that are by their own nature called relative are called
so sometimes in these senses, sometimes if the classes that include
them are of this sort; e.g. medicine is a relative term because its
genus, science, is thought to be a relative term. Further, there are
the properties in virtue of which the things that have them are called
relative, e.g. equality is relative because the equal is, and likeness
because the like is. Other things are relative by accident; e.g. a man
is relative because he happens to be double of something and double is
a relative term; or the white is relative, if the same thing happens
to be double and white
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