Montages of this type are created by assembling elements of a larger image as "tiles". No attempt is normally made to conceal the boundaries of each "tile". This basic technique is still used on tiled walls, such as those found in kitchens and bathrooms. However, more interesting examples of this type of work may perhaps be found on walls in small towns and villages all over Portugal.
The Moors brought the art and craft of ceramic tile making to Portugal many centuries ago. Beautiful artwork can still be found all over the country. Indeed, the Museu Nacional do Azulejo (the Tile Museum), a former convent, was established to preserve tiled walls. The example shown here is of course just a normal single photograph, so might not be considered a photomontage in the strict sense. Nevertheless, the result is well executed and shows clearly the age-old principle involved.
A quite different approach can be seen in the montage below. Here, the photographer has taken numerous images from a single point and assembled them in an pleasing manner to create an unusual panoramic image of the original scene.
Image personnelle de Yann Chemineau, 2007 {{cc-by-sa-2.0-fr}} http://yann.ouvaton.org/ http://commons.wikimedia.org/wiki/Category:Nantes" title="Category:Nantes">category:Nantes