To call it experiencing is to distinguish it from appearance, from the concept of appearance. It is what it is and not the veil thrown over some hidden reality. It is what it is, but you cannot say just what it is, you don't have the concepts for it. That is why you can inquire into the experiencing, open-endedly, that it reveal what is already revealed. This is the only way that truth can be understood, it's not even an open secret because it isn't a secret. If anything is secret it is the prejudices to which understanding is subjected and which are to fall away as they are exposed.