What is going on in this painting of anti-ship spikes(?)

[DURABLE, REUSABLE AND COST-EFFECTIVE] The bird spikes stab and base are made of genuine 304 stainless steel which is anti-corrosion, and weather

LANNEY Bird Spikes, 10 Strips Stainless Steel Bird Deterrent Pigeon Spikes for Outside to Keep Birds Away, Anti Bird Repellent Spikes Control Kit

Francis Scott Key: One of the anti-slavery movement's great villains

English ship Revenge at Battle of Gravelines (1588) - Invincible Armada (cropped) - PICRYL - Public Domain Media Search Engine Public Domain Search

Birds have co-opted anti-bird spikes to build nests. Genius! - Vox

They forged the last links with their lives': Sir John Franklin's Men Dying by Their Boat During the North-West Passage Expedition

National Museum of American History

Israeli weapons maker Rafael unveils new state-of-the-art anti-ship missile

Ninja Deterrent™ Gizagiza Stainless L Type 1 Meter Security Fence Spikes Made in Japan Anti Climb Effective Shinobi Gaeshi

18 Anti-Piracy Weapons for Ships to Fight Pirates

What is going on in this painting of anti-ship spikes(?)