[3] The poem is created by members of Utrechts Guild of Poets and was started by Ruben van Gogh, Ingmar Heytze, Chrétien Breukers, Alexis de Roode, and Ellen Deckwitz.

[11] Stones with year numbers mark the planned route and turn the growing line of letters into a meter of time.

[13] The concept for the Letters of Utrecht grew out of Milliongenerations' work of milliongenerations.org and was inspired by the efforts of Danny Hillis and the Long Now Foundation to build a 10,000 Year Clock to promote long-term thinking.

The Long Now Foundation had contributed a stone cut from the Sierra Diablo Mountain Range[14] in Texas where the 10,000 Year Clock is being built.

[15] As a social sculpture, The Letters of Utrecht refer to the 7000 Oaks of Joseph Beuys in Kassel, Germany.