My Shadow

Through the day and night, my shadow goes in and out with me.
He reflects a purpose with more than meets the eye.
He is like my twin brother from head to toe.

He acts like a monkey.
Very much of monkey see, monkey do.
He sometimes quickly goes from being shorter or taller than me.

He is like my reflection through the day and night.
He reflects my actions, but lacks to reflect every emotion.
From the many joys in life.
To the main pains and sorrows in life.