I think when a man first discovers that two and two is four, there is 'beauty' in that; and we can see why. But if people stand and look at the moon and one says 'I think it's just beautiful tonight' and the other says 'The moon makes me feel awful' we are both 'clear'. A geometric shape - we know why we like it; and an unreasonable shape; it has a certain mystery that we recognize as real; but it is difficult to put these things in an objective way.