No color
The EV3 Color Sensor can detect 7 different colors, plus the absence of color.
Each of these 8 colors is labeled with a different number.
Exercice
What does the No Color "color" mean in the Set of Colors menu?
Change your program so that it waits for "No Color" (Option 0). Make sure you unselect all the other colors.
Place various objects in front of the Color Sensor, and run the program.
What triggers the Wait For No Color Block? Try it!
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The "No Color" option is triggered when there is no object in front of the Color Sensor!
Note that "No Color" is not the same as Black or White!
It really means NO COLOR is being detected!