The palace is shaped like an octagon (the shape given to a coconut before being served), while the roof is shaped like a traditional Filipino salakot or hat. Some of its highlights are the 101 coconut-shell chandelier, and the dining table made of 40,000 tiny pieces of inlaid coconut shells. Highlighted as one of the Cultural Center of the Philippines’ most striking structures for its architecture and interiors, the palace celebrates the coconut as the ultimate “ Tree of Life ”. From the coconut's roots to its trunk, bark, fruit, flower and shell, the palace's design, form and ornamentation echo these elements. 
You mean to tell me this does not work at night and only works during the day? Then a battery will be needed to store the energy? Waht's the point? Sounds costly to me. That doesn't make sense specially if these are for poor people. The spaces of the houses of those poor people are dark because they didn't put "openings" in them to allow daylight to come in. They enclosed it with concrete blocks and corrugated metal. It's all too easy to get carried away with "bright" objects such as these, but we need to step back and think about what the real problem here is. The real problem is poorly designed spaces for poor people. This can be solved by simply opening up the spaces, providing openings in those hollow block walls and let daylight into those spaces. This bottle solution is simply "green washing" it under the guise of re-using plastic bottles. If you open up the spaces, you get light from the sun during the day, then light from the moon during night. No need for collecting plastic bottles nor batteries.
Nakpil studied civil engineering at the University of Kansas, supporting himself by working as a pianist with the Filipino Strong Orchestra, and later as a partial scholar of the Philippine government and with assistance from his uncle, the nationalist and philanthropist, Dr. Ariston Bautista-Lin. There he obtained his degree in civil engineering in 1922. However, he was not content, and with his uncle’s encouragement, he decided to pursue his true passion, travelling to France to study architecture at the Fountainebleau School of Fine Arts. Nakpil studied with the noted architects Carlu and Lalouz and was listed among the top ten in his class of forty, easily gaining the Diplome d’ Architecture. He returned to the United States with a Joseph Evelyth fellowship to Harvard University where he got his master’s degree in architecture in 1926.