protected function availableArt()
{
// Find all of the art in the assets directory.
$finder = new Finder();
$finder->files()->in($this->config->get('assets_dir'))->depth('== 0')->name('*.txt')->sortbyname();
return array_values(array_map(function ($file) {
return $file->getBasename('.txt');
}, (array) $finder->getIterator()));
}