# Celestial Atlas × Portolan Chart — composed image prompt
# IndexStyle — https://indexstyle.org/compose?ids=celestial-atlas+portolan-chart
# Celestial Atlas carries the structure. Portolan Chart appear as accents, each further back than the last.
# Style descriptors only. Never imitates a specific artist, studio, brand or work.

An original image that takes its structure from Celestial Atlas (Style, 17th–19th century) and its accent from Portolan Chart (Style, 13th–17th century). Structural cues: Myth figures over stars; Concentric celestial structure; Gold and blue coloring; Ornamented cartouches. Accent cues, used sparingly: Radiating rhumb lines; Names perpendicular to coasts; The vellum ground; Flags and monsters as ornament. Composition: Concentric spheres at the center, four corners filled with cartouches. Type and lettering: Title inside an ornamented frame, star names tiny and italic. Let one material quality come from the second style: Black and red on a vellum ground, flags and monsters in open water. Mood: Exhilaration, Luxury, Calm, Trust, Nostalgia. Color: build on #e9e6dd, #67635d, #171615 with a single accent drawn from #e9e6dd, #67635d, #171615. Constraints: do not imitate, reference or name any specific artist, studio, brand, character or copyrighted work. Produce an original composition in the general period languages described above.

# Where the two fight
# - Both belong to Diagrammatic Expression, so the difference is small. Push the roles further apart than feels comfortable.

# Cautions carried from each entry
# - Celestial Atlas: Drawing the myth figures so large that the star positions vanish leaves a plate working neither as diagram nor as ornament.
# - Portolan Chart: Drawing rhumb lines as pattern while ignoring how they answer the roses gives ornament that no longer looks like an instrument of navigation.

# Design specs: https://indexstyle.org/styles/celestial-atlas/design.md · https://indexstyle.org/styles/portolan-chart/design.md