If you look at the context clues by reading the picture, what does the apple represent? Click on the apple for the bigger picture.
Could it be the story of Adam and Eve? No?
What about that universe inside the apple? Do you remember the story about Sir Isaac Newton and how an apple dropped on his head while napping and voila he realized there must be some force acting on the falling apple, and everything else for that matter.
Over at BrainPickings they reviewed 75 Scientific Mysteries, Illustrated by Today's Hottest Artists, a book that explores scientific complexities through pictures, including gravity and the big bang.
About gravity, Terry Matilsky notes:
[T]he story is not finished. We know that general relativity is not the final answer, because we have not been able to synthesize gravity with the other known laws of physics in a comprehensive “theory of everything."Another artist illustrates his vision of what existed before the Big Bang
Brian Yanny asks:
Was there an era before our own, out of which our current universe was born? Do the laws of physics, the dimensions of space-time, the strengths and types and asymmetries of nature’s forces and particles, and the potential for life have to be as we observe them, or is there a branching multi-verse of earlier and later epochs filled with unimaginably exotic realms? We do not know.Do illustrations help you "picture" complex phenomena? Would you like to see more illustrations in your scientific textbooks?