Pictures will never do this creation justice. I have three different shots to try to get you to see what it looks like. IRL it changes depending on the light so we tried to change the light when we took pictures. This is what the glass picture looks like when there is no light behind it. Notice the background is blue.
As the day goes on pretend that more sunlight is coming behind it. What will happen is you will begin to see some red behind the tree. When the light is completely behind the tree, a full sunset appears. This is not three separate projects. These effects are created by building layers on the glass and playing with lighting.