Answer:
What is easy to spot but hard to find?
Four fingers and a thumb, yet flesh and blood I have none. What am I?
I am black within and red without; with four corners round about. What am I?
I am the outstretched fingers that seize and hold the wind. Wisdom flows from me in other hands. Upon me are sweet dreams dreamt my merest touch brings laughter.
I always have to work with something in my eye. What am I?
No matter how little or how much you use me, you change me every month.