I love the color blue from its palest hue to navy/indigo.
Oh nice. Blue is my favorite color too. I'm glad I'm not color blind. 
Yes colorblindness can make educational activities difficult.
How many shades of blue are there? 
It really depends on your ability to perceive color.  It is one of three primary pigments. 
Interesting. Do people perceive color differently? 
Yes we all do, it's visual perception
That is why we all have different favorite colors then