It's very difficult to make you understand things.

Time and space are only forms of thought.' 'I see,' said Cyril.
'No, you don't,' said the Psammead, 'and it doesn't matter if you don't, either.

What I mean is that if you were only made the right way, you could see everything happening in the same place at the same time.

Now do you see ?' 'I'm afraid _I_ don't,' said Anthea; 'I'm sorry I'm so stupid.' 'Well, at any rate, you see this.

That lost half of the Amulet is in the Past.