 There are also some very famous arguments against the immanent realist view of properties and relations. First, it is not clear that it is coherent to say that there is such a thing as redness and that this one thing exists in many different objects at the same time. Second, it is not clear what it is for an object to possess a property on the immanent realist view. Most immanent realists would not say that property possession is a full-blown relation, for this would just be another universal, and it is commonly thought that if immanent realists adopted this view, it would lead to an unacceptable infinite regress. (If we're told that an object a possesses Fness iff a stands in the possession relation to Fness, then one might ask, “What is it for an object and a property to stand in the possession relation to one another?”, and so on. For more on this, see the entry on  properties.)  In light of this, many immanent realists maintain that when an object a possesses a property Fness, a and Fness are “linked together” in some non-relational way, e.g., a way that is more intimate, or primitive, than ordinary relational connections. But it is not clear what this really amounts to. (Immanent realists might respond that platonists also have a problem here — i.e., that platonists also have to provide an account of the relation, or “connection”, between objects and properties. But some platonists might argue that the problem isn't as bad for them because platonistic properties are causally inert, and so they are not responsible in any way for objects having the natures they have, and they do not play any important role in our explanations of why objects have the natures they have. For instance, if a is F, Fness is not responsible in any way for a having the nature that it has. Thus, platonists might claim that a is simply an example of Fness and that there is no more to their relation than  that.[11]  Immanent realists, however, think that ordinary physical objects are the way they are because they possess the properties they do. Thus, they seem committed to the thesis that there is some sort of physically substantial connection, or link, between objects and their properties, and it is not at all clear what this could be. There has been a lot of philosophy dedicated to this problem, but there is no consensus on how (or whether) it can be solved.)