Full Idea
There are properties which nothing can possibly have; an example is the property of being both round and square.
Gist of Idea
Some properties can never be had, like being a round square
Source
Roderick Chisholm (Person and Object [1976], 4.2)
Book Reference
Chisholm,Roderick: 'Person and Object' [Open Court 1976], p.119
A Reaction
This is a rather bizarre Meinongian claim. For a start it sounds like two properties not one. Is there a property of being both 'over here' and 'over there'? We might say the round-square property must exist, for God to fail to implement it (?)