Answer:
Twigs and spheres and poles and plates. Join and bind to reason make.
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
Look into my face and I'm everybody. Scratch my back and I'm nobody.
This is rectangular, hollow and has a lid, and where you’ll find it you might wonder, it is just six feet under. What is it?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
I am your mother's brother's only brother in law. Who am I?