>So, I'd say We'll have to wait some 35 years more to be sure Escher's works
>are public domain...

Note that in visual arts there is also moral right, and it is perpetual as
well as inalienable in EU. It may be transmitted mortis causa to the heirs
of the author. (i.g Arts Foundations etc)
http://www.studiolo.org/CIP/VARA/Failing/Failing.htm
http://en.wikipedia.org/wiki/Moral_rights

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