Answer:
Do you know what you can hold without ever touching it?
Twigs and spheres and poles and plates. Join and bind to reason make.
Three little letters, a paradox to some. The worse that it is, the better it becomes.
I am seen in the water. If seen in the sky, I am in the rainbow, a jay's feather, and lapis lazuli.
You use a knife to slice my head. And weep beside me when I am dead.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?