At such a time I’ll loose my daughter to him,

Be you and I behind an arras then.

[II, ii, 160-163]

As the moment for the observation approaches, the King explains the plan to the Queen.

Her father and myself (lawful espials)

Will so bestow ourselves that, seeing unseen,

We may of their encounter frankly judge.

[III, i, 32-34]

Upon hearing Hamlet approach, Polonius calls to the King,