Have you ever try suddenly forgot something?
Mr.4D, secret creature, eats your time and memory .
Light calligraphy is the only way to communicate with 4D creature. Because it is the only way can put movement into one image. In the eyes of 4D, my movement is been recorded on the time axis. For humans, 3D, our movement will not last permanently, in the next second our movement no longer exists. For 4D, time is just another dimension, he can see time.