Un-prismatic pool Un-prismatic pool. This is in fact partly frozen pool of water in a swamp, hence the brown color in the ice. Share this:Click to share on Twitter (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)Click to email a link to a friend (Opens in new window)Click to share on Facebook (Opens in new window) Skip back to main navigation