LinkedIn: What do you think is the essential difference between an architect and a designer?

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What do you think is the essential difference between an architect and a designer?
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I use the article (Architecture, Design, Implementation, A. Eden and R. Kazman, International conference on software Engineering – ICSE, May 3-10, 2003, Portland, OR.) which illustrates the distinction between architecture, design and implementation by the Intension/Locality thesis:
• architectural specifications are intensional (i.e. there may be many possible instances) and non-local (i.e. mandatory for all parts of a system);
• design specifications are intensional but local;
• implementation specifications are extensional (i.e. only one instance is possible) and local.

Thanks,
AS