It is your own mind, and it disguises itself as spirit or ghost or angel or whatever form you wish it to come to you, or in whatever form you are accustomed to see it. It will never come under a form strange to you, such as you have never known; it will only come in the form to which you are accustomed. For instance, if you were to see a dog with wings, it is still the same form; you are familiar with a dog. It is only that the mixture of combination is curious. Though wings are attached to the dog, the form is not actually new; you are seeing something which you recognize.