Answer:
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen.
What two things can always see what the other sees, but can never see each other?
Soldiers line up spaced with pride. Two long rows lined side by side. One sole unit can decide, if the rows will unite or divide.
It's equally comfortable in an orchestra and a geometry textbook. What is it?
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
I can only be played on a windy day
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?