Answer:
I am easy to see but no one likes looking at me. Without me there would be no you. I can make you complain or make you happy. But you almost always take me for-granted.
I am sometimes referred to as chips
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 am black within and red without; with four corners round about. What am I?
Six letters do my name compound; among the aged oft I'm found; The shepherd also by the brook hears me when Leaning on his crook; but in the middle me divide and take the half on either side each backward read a liquor tell ev'ry gay toper knows it well.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.