Answer:
What hangs others yet can unintentionally hang itself?
I have three hundred cattle, with a single nose cord
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
Twigs and spheres and poles and plates. Join and bind to reason make.
I have an eye but cannot see, You'll head inside when you see me.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.