Which ancient civilization first developed the concept of the 'shop front' with product displays visible from the street, similar to modern storefront window displays?

The ancient world was home to sophisticated retail systems that would influence commerce for millennia. From the agoras of Greece to the forums of Rome and the bazaars of Mesopotamia, ancient civilizations developed innovative merchandising techniques and retail spaces that still echo in today's shopping experiences. This trivia explores a fascinating aspect of ancient retail design that revolutionized how merchants displayed their wares and engaged with customers.

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Ancient Egyptians, who created display niches in marketplace walls to showcase luxury goods to passing nobility
Ancient Romans, who pioneered the tabernae with wide openings facing streets where goods were visibly arranged on counters
Mesopotamians, who designed stepped platforms outside their shops to display goods in a hierarchical arrangement based on value
Ancient Greeks, who created the first stoa galleries with columned displays to showcase merchandise protected from the elements