Unique Pairs in the Universe.
The Sun and the Moon.
The Day and the Night.
The Earth and the Sky.
The Dark and the Light.
The Cup and the Saucer.
The Shoes and the Socks
The Bread and the Butter.
The Salt and the Pepper
The Fork and the Knife.
The Pen and the Paper.
The Pencil and the Eraser.
The Needle and the Thread.
The Left and the Right....