to set the context

I had come across the Ellen's bill board 24 Aug.  It was blank.  I drew on it the image of the mountain.  Returned on the 27th, it had been blanked out.  I redrew.  Blanked again 2 days later.  Redrew.  Discovered the bill board had been blacked out 31st.  Soon the Mountain re emerged white in a night sky.  Found blacked out again at dawn, 4 Sept.  Mountain re emerged by early morning.  What happens next?

Below, # 1 thru 10  illustrate the context and technique of the drawing by Ellen's.