[emw]

It's also fun doing this on Wikidata with "subclass of".

* Go to a Wikidata item, e.g. "sailboat" [1]

* Click on the "subclass of" (P279) value or, if no such value exists, the "instance of" (P31) value

* Follow the "subclass of" chain up to "entity" [2]

You can do the reverse -- i.e. go down the classification tree -- with tools like Wikidata Generic Tree [3].

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1. https://www.wikidata.org/wiki/Q1075310

2. https://www.wikidata.org/wiki/Q35120

3. http://tools.wmflabs.org/wikidata-todo/tree.html?q=Q35120&rp...