Docker images physical storage place

Where can be images found in the filesystem? If I list all available images with docker images I see a size for every image. Are there single files with the given sizes in the filesystem or it is only estimated size of an image?

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    No, you cannot see individual image files on the file system.

    They are stored in a large sparse image file in /var/lib/docker/devicemapper

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.