Well, certainly, if you have such a document, just have it. You may have even several documents certifying several your identities. Yes. Why not? There are people who maintain that “I” consists of many persons – well, of several persons, it doesn't matter if the number does or does not matter – and each of these smaller “I”s (let me write “i” to make things easier and more clear) should have its (or i's) own document. This is very interesting concept. “i”s can have either a diachronic aspect (i-past, i-present, i-future...) or a synchronic or a synchronic-space aspect (i-internal, i-external, i-as-i-seem-to-be, i-social, i-familial, i-individual...) The phenomenon of bilocation or staying simultaneously in two places, even quite distant, seems nothing special or extraordinary when analysed and seen from this perspective. We could even discuss the phenomenon of multilocation. However both phenomena would demand of “i”s a significant autonomy enabling them to act separately and independently. It is not so sure whether the autonomy of such range might be possible. Could the cube's faces and the cube be separated without annihilating the cube itself? There are quite a lot of people who think, who are convinced, they have been transformed and now they are someone else than they were before, so any document issued before the transformation certifies the identity of someone else and that is why there is a need to have a new document issued after the transformation. Surely, there are various kinds of transformations, some of them are complete and total, while the others are but partial and then somebody transformed partially is somebody else only partially and partially the same as was before. Well, but is a complete and total transformation possible? A butterfly is something really different than a caterpillar, however both are made of the same material. It looks like making a table from an old cupboard – you are sitting at the table without even the slightest idea it might be a cupboard in the past while the planks and boards are exactly the same. Not all transformations are abrupt, sudden, unexpected (or expected), violent, spectacular. We keep transforming ourselves all the time. Slowly and steadily. Well, in fact every day we wake up as somebody else than the one who went to bed, however the difference is unnoticeable (or almost unnoticeable – or sometimes it's noticeable easily provided that we still preserved the abilities to notice anything). Although it is very very difficult to distinguish yesterday-me from today-me, it is not that hard to distinguish last-year-me from last-week-me ..... Although it is so easy to distinguish remote-past-me from present-me, it's really a problem to recognize remote-past-me as present-me, as myself. I'm afraid we usually pretend we recognize ourselves while in fact we are deeply astonished and upset and confused when somebody is trying to convince us the strange looking guy in the picture is identical with the not strange looking guy holding the picture. We are pondering how we could do things so bizarre – undoubtedly we wouldn't do such things now. Let's think about some legislative consequences. For example: a lawyer could maintain, quite legitimately and with good reasons, that the one who committed the crime is somebody else than (not identical with) the one in the dock. For example: if someone wrote the last will ten years before his death the one indicated as a heir to his wealth does not exist now – the one who exists now and who maintain that he is the one indicated as a heir to this wealth can be so different than the one mentioned in the last will (for example: he could experienced a great transformation...) that most probably the deceased would have never bequeathed him his treasure, not even a tiny part of it. The examples can be multiplied almost endlessly, but I think everybody can do this himself or herself or itself, certainly if he or she or it finds such examples amusing – more likely they will be quite gloomy and giving no fun, so it will be just a waste of time. The time spared in that way could be used for solving another dilemma: can a butterfly be charged with caterpillar's deeds? The conclusion is that one should have not one document but a big suitcase of documents. A trunk of scraps. Shelves of sheets. Should bring here whole huge library. Files and archives exploding with certificates, application forms, contracts and diplomas. Caravans meandering endlessly. Columns of carriers winding and winding and winding up to the horizon..... These documents will need authentications – certificates certifying that the certifications are genuine. However these certificates will also need authentication. We need to be vigilant – a forgery can happen everywhere and at any time..... Well, but if someone was disgusted with endless gathering piles of useless scraps, one could make those needed and necessary documents and certificates by oneself. Such documents and certificates will be genuine with no doubt and no forgery could happen. Such documents and certificates would tell quite a lot about the state of mind of their producer. A handmade passport would be with no doubt more interesting than a passport printed in millions of copies and distinguishable form all other copies only with a photo – but this is sort of truth in the case of us: we are not so distinguishable from each other as we think and expect ...... Anyway, please do not expect either, there's any downloadable template here. You are not that lazy if you have reached this very place.