Answer:
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.
What is lengthened by being cut at both ends?
What has three ways out and just one way in?
Thousands of these come together to make a digital image. What is it?
I'm the source of all emotion, but I'm caged in a white prison.
My days are numbered. What am I?