An eater is a stable object with a job
Eater 1 is a still life, but its importance comes from behavior in reactions. It can absorb selected debris and recover, which makes it a cleanup tool rather than a passive object.
That is the conceptual upgrade from common still lifes: the same stable object can become part of a larger mechanism.
Herschel turns methuselah behavior into circuitry
The B-heptomino is a small methuselah that passes through a Herschel. Herschel pages matter because many Life conduits are described by how they accept, transform, delay, or output Herschels.
This gives readers a path from beginner long-lived patterns to advanced signal vocabulary.
Reflectors complete the signal story
A reflector changes the direction of a moving signal. The Snark is a famous stable 90-degree glider reflector, so it belongs in the vocabulary of glider logic and circuitry.
Even before a full Snark demo is added, the article can establish the vocabulary and link users to runnable eaters, Herschels, and glider guns.
Working takeaway
Use Eater 1 as the first engineering page, Herschel as the signal object, and Snark as the next advanced concept to add when the catalogue grows.