Furthermore, 104
in sleep or in waking, the ideas are different, because we
do not see things in the same way when we are awake as we do in
sleep; neither do we see them in the same way in sleep as we do
when awake, so that the existence or non-existence of these
things is not absolute, but relative, that is in relation to a
sleeping or waking condition. It is therefore probable that we
see those things in sleep which in a waking condition do not
exist, but they are not altogether non-existent, for they exist
in sleep, just as those things which exist when we are awake,
exist, although they do not exist in sleep. Furthermore, things 105
present themselves differently according to the age of life,
for the same air seems cold to the aged, but temperate to those
in their prime, and the same color appears dim to those who are
old, and bright to those in their prime, and likewise the same
tone seems faint to the former, and audible to the latter.
People in different ages are also differently disposed 106
towards things to be chosen or avoided; children, for example,
are very fond of balls and hoops, while those in their prime
prefer other things, and the old still others, from which it
follows that the ideas in regard to the same objects differ in
different periods of life. Furthermore, things appear different 107
in a condition of motion and rest, since that which we see at
rest when we are still, seems to move when we are sailing
by it.
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