Answer:
I am a portal to another world which you cannot enter. Only you can see me but I can't see you.
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure a matter of course. I am given with pleasure when taken by force.
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
Lovely and round, I shine with pale light. Grown in the darkness, a lady's delight. What am I?
What is always coming but never arrives?