the artist and designer have co coated the building with l.e.d. lights that change based on how the chinese people feel. how do we know? big data, of course, from china s web users of which there are nearly 600 million. each day software analyzes millions of emoticons from sites like the chinese version of twitter. they analyze data and control the pace and brightness of the lights. fast pulses for a more excited populous, a softer glow for a calm country. next, new world meets old world. the colors, yellows, reds, blues, purples are determined from the ancient chinese text. what it may lack in precision in explaining china s exact national mood, it more than makes up for in beauty. the correct answer to our gps challenge question was d.