Excellent Moose introductions and tutorials

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Modern Perl (see also the Modern Perl book) is based on, among other things, Moose as an object system, built on Perl 5's innate but spare O-O abilities.

This introduction [houseabsolute.com] explains not only Moose itself but quickly, and fairly painlessly, brings you into modern object orientation.

Also, Moose Is Perl − A Guide to the New Revolution [oreilly.com] − an over 400-page guide from the introductory to the detailed.