Art and design blog Kitsune Noir has been offering its compiled music 'Mixcasts' for a while now. Each comes with artwork. Yet as a digital download, it doesn't actually require any more than a text track list but it could be argued that the imagery allows the opportunity to build on the theme of the compilation itself with something substantially more evocative. However, I would suggest that the proportions and layout needn't follow the same template of a CD version given the freedom of a non-physical release. These, while beautiful, do seem to conform to some agreed idea about what a tangible music format should be.