He could no longer build anything, whether a private residence in his Pennsylvania county or a church in Brazil , without it being obvious that he had done it, and while here and there he was taken to task for again developing the same airy technique , they were such fanciful and sometimes even playful buildings that the public felt assured by its sense of recognition after a time , a quality of authentic uniqueness about them, which, once established by an artist as his private vision , is no longer disputable as to its other values .