Matsya Purana — Design and Splendour of Tripura: Maya’s Threefold Moving Fortress
एकैकस्मिन्पुरे तस्मिन् गोपुराणां शतं शतम् सपताकाध्वजवतां दृश्यन्ते गिरिशृङ्गवत् //
ekaikasminpure tasmin gopurāṇāṃ śataṃ śatam sapatākādhvajavatāṃ dṛśyante giriśṛṅgavat //
In each city there were hundreds upon hundreds of gateway‑towers (gopuras), furnished with pennants and flags, appearing like mountain peaks.
This verse does not describe pralaya; it focuses on the visible grandeur of a well-planned city, emphasizing monumental gateways rather than cosmic dissolution.
It aligns with royal duty (rājadharma) to build and maintain prosperous, secure, and dignified cities—marked by strong gateways and public symbols (flags/banners) that signify order, protection, and civic prestige.
Architecturally, it highlights numerous gopuras (gateway-towers) as key urban/temple thresholds; ritually and symbolically, dhvajas and patākās mark auspiciousness, authority, and celebration at prominent entrances.