Answer:
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
I let water fall on you while everyone else stays dry. What am I?
What has one eye but cannot see?
My geometry is lost in the night to be found in daylight's break. The rigors of time have torn me to shreds, yet I stand to protect that which lies within. What am I?
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
A doctor might remove one from the neck of a Dracula victim.