Actually, I was hoping to avoid the truth in this thread, but it looks like you forced the point, train. You just had to do it.
And the truth is
...
...
That there is no blue in Magic at all!
There is white, black, green, red....colorless...
And the color SCUMBAG which gets confused as blue because the borders of the original cards used to be blue/cyan but have now gone cyan. To say cyan, or possibly azure, is a color in Magic would be more correct. However, the SCUMBAG color cards are actually SCUMBAG, and not blue at all.
Island is such a card, because it has a SCUMBAG mana symbol on it. Similarly, Coastal Tower is not a colorless land, but a SCUMBAG land that happens to be a land too. Like artifact lands, rules wise.