Book of Hours.

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For the lovers of the books: Some specials Books of Hours.

Book of Hours, 15th Century, Heart-Shaped when opened 
the little book of hours of Amiens Nicolas Blairie
 carefully written on a thin Ruling rose, but modestly decorated
 with some original illuminations in ink (folio 29),
 has the curious shape of an almond when it is closed.
 When it opens, the two halves of the almond bloom to fit the contours
 of a heart, concrete evocation of the heart of the person
 praying the prayer that opens.

Chansonnier de Jean de Montchenu, 1470, a cordiform music manuscript,
 Collection Henri de Rothschild MS 2973, the National Library of France.

The "Codex Rotundus" owes its name to its round shape.
 It is a small book of hours (9 cm diameter) made in Bruges in 1480.

 Thumbnails are most likely from the workshop
 of Dutchman Willem Date illuminator.

Book of Astrology and Omens, Nepal,
 14th-16th Century, via LACMA Collections.

Fleur de Lys shaped Book of Hours, created in Paris, 1553.
 It contains eleven lobe-shaped miniatures. 

 Home page of it has a golden line framing average
 lily and inside text is written in black ink.
 It is also illuminated with colorful miniatures
 depicting religious scenes.

Round Book (Un libro rotondo), 1590.
 Principe e Vescovo Julius Echter von Mespelbrunn (1545-1617)
 Biblioteca Università, Würzburg, Germany.