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1) Typical sundial design: gnomon casting shadow and indicating the time of the day
2) Reversed concept: the time is indicated by a gap in the surface casting shadows and generating renewable energy
3) Sun’s apparent path in the sky of Houston during different seasons and times of the day
4)The shape of the sunpath is simplified into a cylindrical section with the surface perpendicular to the diurnal motion at the equinoxes
5)The shape is enlarged around noon and tapered at sunrise and sunset. This configuration optimizes the exposure of the photovoltaic cell surface by increasing it during the peak sun hours
6)An opening oriented in the direction of every solar hour of the day is cut into the surface
7) A system of louvers oriented to let the sunlight reach the ground one hour at a time while shading the other hours is introduced
8) The circular shapes of the openings are adjusted to elliptical shapes to project a circular image on the ground.
9)The different hours are displayed by the sunlight casted in the shape of symbols reminiscent of the face of a clock
10) Colored glass filters ranging from pink in the morning to blue in the evening filter the sunlight to emphasize the different hours.
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