Feedback

Again, I'm not actually suggesting that you merge this in and remove all your code. This just makes it easier to leave feedback :smile: 

Please submit a help request for any questions that you have about my comments.

### Don't merge this pull request
`x >= left && x <= right && y >= bottom && y <= top` is already going to return true or false, so the conditional is unnecessary:

```ruby
  def contains_point?(x, y)
    x >= left && x <= right && y >= bottom && y <= top
  end
```