DESIGN BRIEF: Kochi Water Metro photographs like infrastructure — glass, aluminium, GPS boards — and Mithila contour breaks the second you import vanishing-point realism. Kachni solves the translation: the catamaran becomes a flat bilateral silhouette with window registers read as folk geometry, the backwater becomes parallel ripple hatching, and the real Kerala identity lives in palm frond line-work and lotus-pad indigo below the hull. Horizontal-bilateral symmetry keeps the transit subject legible as a centred band — left palm mirrors right palm, outer fish mirror inner fish — the same register classical painters used for river boats on wedding-wall panels without naming a specific operator. I kept birds and cloud at the crest because aerial threshold grammar above aquatic abundance below is non-negotiable Mithila layout discipline; the metro floats between them as contemporary insert, not hero poster. Reflection is deliberately imperfect — wavy hatching bands, not mirror copy — so the water reads hand-painted backwater rather than stock harbour photography. Terracotta tulip frieze on the outer border ties Kerala floral abundance to Bihar border vocabulary without importing Bharni deity colour floods.