The point of Composite image is to go beyond of what your camera can do. It is also when many photo are tooken and combined together.When you do a composite image you want more than one photo. You want to take more than one because you may get things that your normal camera might of never got. When You take the pictures you take it vertical because it covers the ground and sky. If it horizontal it cuts out the sky.
If you look at a spherical panos and polar your like there no difference. A polar image is when it shows out of the place and has they sky in it. Also a polar is more opened up compared to a spherical. A spherical image doesn't show much of the sky. Another thing is that a spherical is more like looking at a snow globe and is more curved.
What makes my tiny world convincing is that it all connected and look like an actual world. When I mean connected is that when you make it together it doesn't all match up and also there a line straight in the middle when you make it into a polar. Also it look like a planet to me.