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def self.find_by_tags(*tags)

    tags = tags.to_a.flatten

    initial_tag_search = tags.pop

    matches = find_tagged_with(initial_tag_search) | Category.find_tagged_with(initial_tag_search)

    while p = tags.pop

      new_item_matches = find_tagged_with p

      new_category_matches = Category.find_tagged_with p

      matches_equal_to_or_descended_from_new_category_matches = matches.reject {|match| !match.belongs_to_or_descends_from_one_of? new_category_matches}

      new_item_matches_equal_to_or_descended_from_matches = new_item_matches.reject {|match| !match.belongs_to_or_descends_from_one_of? matches}

      matches = matches_equal_to_or_descended_from_new_category_matches | new_item_matches_equal_to_or_descended_from_matches

    end

    matches.select {|match| match.klass == Item}

  end