(57) It is constituted on the basis of a laminar body (1), made of plastic, which in at
least one of its faces incorporates parallel lenses (2) which offer two image viewing
surfaces (4) and (6), depending on the respective and different points of observation
(3) and (5), in other words, as a function of the relative position between the calendar
and the observer, two different images can be seen of the same calendar. This enables,
for example, the same calendar to have the feast days corresponding to two different
regions, even with legends in their respective languages, and consequently any person
can at all times monitor the feast days of his or her own region and know when necessary
how the feast days are distributed in another region with which he or she has some
kind of relation.
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