Annular Eclipse / Clock

We are tamed to read time with an hour hand and a minute hand.
Let's imagine; change the hands into light - that is, shadow. Instinctively human beings recognize time with light and shadow.
I suggest a product of notion-diversion got from the old time-reading method.

The transparent plate in the morning becomes opaquely dark as time passes. This change give information to recognize the track of time, more exactly its small hands. After the evening, you cannot see the hands visible in daytime. The clock turns like lightning, and there are shadows in place of hands. You read time with a sort of sundial.