Wikidata: list every physical objects

Question

I'm trying to get the name of the all physical things (tangible concepts) Wikidata knows about (objects, places, countries, etc), or in other words everything non-abstract.

There are examples close to what I need, but with only a depth of one: all the things that are instances of phone.

I found this example that searches with more depth and I modified the start point to entity:

#Children of Genghis Khan

#added before 2016-10
 #defaultView:Graph
PREFIX gas: <http://www.bigdata.com/rdf/gas#>

SELECT ?item ?itemLabel ?pic ?linkTo
WHERE
{
  SERVICE gas:service {
    gas:program gas:gasClass "com.bigdata.rdf.graph.analytics.SSSP" ;
                gas:in wd:Q35120 ;
                gas:traversalDirection "Forward" ;
                gas:out ?item ;
                gas:out1 ?depth ;
                gas:maxIterations 4 ;
                gas:linkType wdt:279 .
  }
  OPTIONAL { ?item wdt:P40 ?linkTo }
  OPTIONAL { ?item wdt:P18 ?pic }
  SERVICE wikibase:label {bd:serviceParam wikibase:language "en" }
}

I still get no results.

Answer 1

As mentionned in a comment, your question is too broad and you'll end up with too much answers

You look for the A that are instance of a subclass of B

so the query you point to is the right one

SELECT DISTINCT ?item
WHERE {
   ?item wdt:P31/wdt:P279* wd:Q35120
}

the problem is the size wd:Q35120 has a lot of subclasses You can check that this way

SELECT ?a ?aLabel WHERE { ?a wdt:P279 wd:Q35120.
             SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}

SELECT ?a ?aLabel WHERE { ?a wdt:P279/wdt:P279? wd:Q35120.
             SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}

SELECT ?a ?aLabel WHERE { ?a wdt:P279/wdt:P279?/wdt:P279? wd:Q35120.
             SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}

And so on : you'll see that there are already 40'000+ at forth level which is huge

You could also huge this nice tool to have a more precise view

https://tools.wmflabs.org/bambots/WikidataClasses.php?id=Q35120&lang=en