'Hold on a sec,' Donna called back. 'Is this you?' She pointed up at the ceiling and laughed. 'But you're tiny!'

Hovering above them was a small ball of silver, with flashing lights and wires poking out all over. A tiny computer with a massive voice.

'Yes... well... that depends... er... it's all relative,' said Momus, defensively.

'You're relative all right, matey. Relatively small.'