Answer:
What is the freedom of birds and the pen of old men?
A slow, solemn square-dance of warriors feinting. One by one they fall, warriors fainting, thirty-two on sixty-four.
What do you throw out to use and take in when you're done?
My love, when I gaze on thy beautiful face. Careering along, yet always in place, the thought has often come into my mind. If I ever shall see thy glorious behind.
What is as big as you are and yet does not weight anything?
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.