This is a fantastic image which shows how much life there is in a cubic foot of seawater.
It makes the diet of majestic pelagic filter-feeders like the manta ray and whale sharks more understandable.
It is also worth remembering though that these images under-represent the diversity; it ignores all the organisms too small to see.
In any case, I just bought a copy of the book.
For A World in One Cubic Foot, esteemed nature photographer David Liittschwager took a bright green metal cube-measuring precisely one cubic foot-and set it in various ecosystems around the world, from Costa Rica to Central Park. Working with local scientists, he measured what moved through that small space in a period of twenty-four hours. He then photographed the cube's setting and the plant, animal, and insect life inside it -- anything visible to the naked eye. The result is a stunning portrait of the amazing diversity that can be found in ecosystems around the globe.