This lesson show you how to educate Photoshop about the three dimensionality of a scene so that it can properly maintain perspective when cloning or moving objects. That is done through the use of a filter called Vanishing Point. I'll also show you how to create a layer that contains a perspective grid that can be useful when using the Edit>Transform>Distort feature.Bonus Tip: You can hold Command (Mac), or Ctrl (PC) and drag the middle handle on the edge of a plane to create another plane that is 90° from the plane you are dragging from. I find that feature to be of limited use since it will limit how much control you have over fine-tuning the corners since any change will affect both planes.