Can I Believe My Eyes?

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Across
  1. 2. 1 of the things we need to see. It is the type of unblocked path.
  2. 4. It is the phenomenon that we looked at for this unit. It tricks the brain into seeing something that isn't real.
  3. 6. 1 of the things we need to see. Humans have 2 of them.
  4. 7. 1 of the things we need to see. Examples include a car, a batman toy, or a tree.
Down
  1. 1. Something we see in the world and try to explain.
  2. 3. 1 of the things we need to see. One example is the sun.
  3. 5. 1 of the things we need to see. It is the type of straight path we need.