In traditional Jewish product design, which feature is deliberately incorporated into mezuzah cases to fulfill the religious requirement of 'hiddur mitzvah' (beautification of the commandment)?

Religious product design combines deep spiritual meaning with practical retail considerations. Designers must balance sacred symbolism, cultural sensitivity, and market appeal. This trivia question explores how one major religion's symbols have been thoughtfully incorporated into modern retail products, reflecting both tradition and innovation in the spiritual marketplace. Test your knowledge about the intersection of faith, philosophy, and product design!

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Artistic decoration on the exterior while keeping the sacred scroll inside simple
A plain exterior with the decorative elements hidden inside to symbolize internal faith
Equal decoration on both interior and exterior surfaces to represent balance
Removable decorative panels that are only attached during religious holidays