Trouble drawing a bowl

When I first tried Sketchup (late Feb. early Mar. this year) I saw an article about making a bowl and it worked great. I’ve tried on several occasions to repeat the process without success. Moving the second circle up the blue axis does not turn red or green, what do think is going on?

It’s all about camera position.
If you look down it will be blue, but if you look more to the horizon the colours will change depending on what direction you look.

Here’s a simple bowl.

Thanks Box, great explanation!