Re: あれは何ですか?眼下に見えるカラフルな模様をした...

For more than 100 years, the southern shoreline of San Francisco Bay has been a center for industrial salt production.
Now, in an attempt to roll back the clock, federal and state biologists are working on a 40-year, $1 billion project to restore the ponds to healthy wetlands for fish, wildlife and public recreation.

http://www.southbayrestoration.org/videoaudio.html

それぞれに色がついているのは...謎