There are multiple series in work, and each series has multiple artworks.
Is it possible to use the Select fieldtype with “Option queries” to get a list of ALL artworks across ALL series? It seems like you are only allowed to target a single directory.
Strange, I tested this in a Starterkit before posting, because I wasn’t quite sure if the option existed, and it works for me (Kirby 2.2.3 master branch).