Over the years the image of the clock has been abstracted and stylized to a point where a long and a short line inside a circle, or even inside four dots on the ordinals, can be instantaneously recognized as a clock. This is perfectly fine if you already know how to read the analog clock but it makes no sense to use such a design as a teaching aid.
As a teaching device, you need to make sure all the information that has been abstracted away has been put back.
That is the basic principle of the ccClock
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