Centuries of the Bristlecone

Overview

Centuries of the Bristlecone is Jonathan Keats’s proposed 5,000-year calendar in (From the archive) Jonathon Keats: Envisioning Deep Time. The project uses a bristlecone pine’s growth as a living calendar rather than relying only on abstract standardized time.

Current Profile

The project is a Long Now-style artwork and timekeeping proposal. Stones would be placed around a bristlecone pine at projected growth intervals, and the tree’s future growth would eventually disturb or overturn them. The calendar therefore measures time through living growth, climate, and ecological conditions rather than through fixed human units alone.

Key Characteristics

• The project uses a bristlecone pine as the timekeeping medium.
• It is designed for a 5,000-year horizon rather than a human lifetime.
• Its marks can drift from the Gregorian calendar because tree rings respond to lived environmental conditions.
• It turns calendar disagreement into a philosophical question about which temporal system should be treated as authoritative.
• The source links the proposal to Long Now’s Mount Washington site in eastern Nevada.

Evidence

Living Calendar Medium

• (From the archive) Jonathon Keats: Envisioning Deep Time says Keats introduced the project publicly as a calendar kept according to life on Earth rather than abstract regularity.
• (From the archive) Jonathon Keats: Envisioning Deep Time explains that the proposed stones would be placed around the tree at projected growth intervals and eventually be overturned by the tree.

Long Now Site Context

• (From the archive) Jonathon Keats: Envisioning Deep Time says Long Now owns more than 800 acres at Mount Washington in eastern Nevada and that Keats had begun discussing implementation there.

Calendar Challenge

• (From the archive) Jonathon Keats: Envisioning Deep Time says the project would fall out of sync with the Gregorian calendar, making calendar correctness a live question rather than a settled convention.

Qualifications

The source presents many implementation details as unresolved and humorously provisional. It does not establish final engineering, ecological, conservation, or site-management details.

What Changed

• Added Centuries of the Bristlecone as a concrete project node for Keats’s deep-time art.
• Connected the project to ecological timekeeping and Long Now’s Nevada site context.

Relationships

• Jonathan Keats - project originator.
• Long Now - institutional and site collaborator context.
• Ecological Timekeeping - conceptual frame for using living systems as calendars.
• Deep-Time Mental Prosthesis - adjacent role as a tool for imagining millennial accountability.