The Pentagram and the Golden Angle in Almada Negreiros’ Mural “Começar”

Year: 2018 Authors: Pedro Freitas; Simão Palmeirim Costa

Core claim

Almada Negreiros created original geometric constructions in Começar that approximate the golden angle and link the pentagram, golden section, and a universal Canon.

Topics

golden angle, pentagram geometry, geometric abstraction, art-historical analysis

Domains

Euclidean geometry, circle division, golden ratio, approximation error, Portuguese modernism, mural art, visual arts, geometric abstraction

Methods

geometric reconstruction, angle measurement, error calculation, image analysis

Media

mural, ruler and compass drawings, GeoGebra, annotations

Source status

This page publishes metadata and extracted analytical signals only. Raw PDF and full OCR text are kept local for now.