Answer:
What goes through a door but never goes in. And never comes out?
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.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
Hard to catch, easy to hold. Can't be seen, unless it's cold.
Dry though I may be, I am still a sea.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?