query: SELECT ?item ?itemLabel ?collection ?collectionLabel WHERE {
    ?item wdt:P31 wd:Q3305213 .
    ?item wdt:P170 ?creator .
    FILTER isBLANK(?creator) .
    OPTIONAL { ?item wdt:P195 ?collection } . 
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }
    } LIMIT 10000