Basalt Libra cover: ink painting of a jellyfish, title in Baskerville Neo display italic
Basalt Libra cover: curtained sleeping nook, title in Baskerville Neo display italic
Basalt Libra cover: black folded paper form over backlit flowers, title in Baskerville Neo display italic

Cover painting: Nagasawa Rosetsu, A Jellyfish Like the Moon, late 18th century. Silhouette motif: Cassie Spiral.

Basalt mark: concentric rings in a vertical block above the wordmark
Orthographic plate: Basalt mark front view and computed lens section A–A
Lens panel diagram with a table of centres of curvature
Fresnel, Œuvres complètes, t. 3 (1866–70), BnF/Gallica.
Unfinished Basalt mobile-web wireframe