This colossal mural claims to be the largest indoor collaborative artwork in the world, measuring 120 feet long and five stories high. Artist Ellen Griesedieck created the massive piece of three-dimensional art as a tribute to the history of work in America. More than 15,000 kids and adults have worked on projects to help create pieces that are part of the mural or will soon be installed. Featuring a teacher, farmer, steel workers, firefighter, police officer, heart surgeons, and more, the mural is intended to inspire and encourage visitors to appreciate…