III · Retention The Long Decay
Cohort 2019 – 2024 Slide 14 / 32
Fig. 14. Reader
activity,
by month.

Subscribers don’t churn —
they fade. Forty-two months later, the page is still open.

Active sessions per 1,000 subscribers Months since signup · 0 → 42
1,000 800 600 400 200 0 M0 M6 M12 M18 M24 M30 M36 M42 Inflection — M18 half-life of attention 912 144
This is the Superstudio Continuous Monument design system, applied by Curio Design — a design-style library for AI agents. Full Superstudio Continuous Monument guide → designbycurio.com/learn/superstudio-continuous-monument