I couldn't get off the ground as the unit vector. I couldn't find my own spark as the quartz. While I was walking in the gathering darkness. I got to reflections every time. I thought I found but I was wrong again. I cling to despair and continue to walk in the darkness.
Quartz is one of crystal that exhibit piezoelectricity. Piezoelectricity is the electric charge that accumulates in certain solid materials(such as crystals, certain ceramic,.....etc.). A unit vector is a normed vector space is a vector of length 1.