the cartoon depicted a thought-provoking picture in which a falling brick results in a whole system's collapse.
from my point of view,it's an exact reflection of the vital importance of tiny things.in other words,to be successful,what we're supposed to emphasize is every step that we take,for any flaws could lead to disaster of the whole system.
in brief,life could be regarded as a chain of various stuffs.only when we attach enough importance to every step,can we truly build up a skyscraper.