Recently I got involved in a conversation where I was asked if I'd ever encountered a spirit that hadn't been written about or encountered in mythology. It was an interesting question to ask, and I responded that I hadn't encountered such an entity and I didn't think it possible, without having some humancentric frame of reference to use in context to the entity. In the subsequent conversation I discussed the conceptualization of entities (which I'll explain in more detail below) and the person I was having the conversation with also shared a story of an entity he encountered that ended up using humancentric frames of reference to connect with the person.
When I talk about conceptualization of an entity I'm referring to the mediation of the entity into a context that is understandable by your average person. If there is no frame of reference it would be very hard to connect with a given entity. In the case of the conversation above, the person was given a name by the entity and ended up researching that name and finding it attributed to a company called Accubar. Whether the entity is the corporate presence of that company, or simply used that name to describe itself is debatable, but it could not engage the person without providing some frame of reference, some concept to help that person understand it.
A concept is a frame of reference used to define an idea, entity, etc,. so that it can be understood and related to. Without a concept you don't have connection. An entity needs to establish itself as a concept that a person can understand in order to relate to the person. The concept provides common ground for the entity and person, because the entity also uses the concept to provide itself a context by which it can interact with a given person. And that's something that should be considered carefully. The benefit of using a concept is that it provides mediation both ways. The entity is meditated into a context that helps the person understand it, but the person is also mediated by the interaction with that concept, so that the entity can also relate to him/her.
I don't think its possible to connect with an entity without some kind of context provided to mediate that connection. There needs to be a medium that enables communication and the possibility of understanding that can come with communication. Without that medium, there is no connection, no way to really verify a contact. The context frames the interaction and provides a way to meaningfully interact with a given entity. Both parties benefit from the conceptualization of an entity into a form that makes sense to the person contacting the entity.
That's my opinion, but its based on my own experiences, as well as looking at the interaction with given act of invocation and evocation. It's also based off the realities of human interaction and limitations.