Answer:
Who spends the day at the window, goes to the table for meals. And hides at night?
My first master has four legs, my second master has two. My first I serve in life, my second I serve in death. Tough I am, yet soft beside. Against ladies cheeks I often reside.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
Though blind as well, can lead the blind well.
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.