Memory:
constantly draw and erase as time passing by.
some are erased earlier/faster, while some are later/slower.
one piece of life/person/object triggers another, affects another and all pieces of memories are contagious.

Final v ideo with settings: (to be uploaded)

Process:
contagious flow: cells darker than a threshhold are able to affect neighbours darker than another threshhold as if transmitting energy to neighbours while consuming its own energy cells.

simulating pencil skeching with time in processing environment