Gravity is a great parallel for God’s law. A thousand years from now, if you throw something up, what will happen? It will come down. A thousand years from now, what is right will still be right and what is wrong will still be wrong. Right and wrong don’t change. Show how the heart obeys gravity and slides down the rope from top to bottom. Then talk about how people try to change right and wrong and suddenly show how the heart no longer obeys but stops in the middle. Of course, this is just a trick to warn your students not to be tricked in life.
There are many other uses for this illusion as well. This is a great way to show the contrast between someone who does what is right and someone who does what is wrong.
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