Fairday's Riddles: Making Sense

Hello, Riddlers! Welcome back to another riddle. We all have them and know what they're about. Can you guess the answer? 

Sense me now in your space, I'll cast a look upon your face. Nothing mass, I shake or groove, entangled in your every move. Pattern plays want and wane, swinging moods twist in twain. Mark your gut and do take note, I'm the root you inner wrote.

What am I? Stop by Friday for the answer

I gave you a clue!