Then slowly and carefully it began to sink under them.

It was like a lift going down with you at the Army and Navy Stores.
'I don't think we ought to wish things without all agreeing to them first,' said Robert, huffishly.

'Hullo! What on earth ?' For unexpectedly and greyly something was coming up all round the four sides of the carpet.

It was as if a wall were being built by magic quickness.

It was a foot high--it was two feet high--three, four, five.
It was shutting out the light--more and more.
Anthea looked up at the sky and the walls that now rose six feet above them.
'We're dropping into the tower,' she screamed.