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 its 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 recognise as real; but it is difficult to put these things in an objective way.