code: function (subject) {
      var kb = UI.store
      var ns = UI.ns
      var t = kb.findTypeURIs(subject)
      if (t[ns.ldp('Container').uri] || t[ns.ldp('BasicContainer').uri]) {
        var contents = kb.each(subject, ns.ldp('contains'))
        var count = 0
        contents.map(function (file) {
          if (UI.widgets.isImage(file)) count++
        })
        return count > 0 ? 'Slideshow' : null
      }
      return null
    }
docs: Does the subject deserve an slideshow pane?