The triangle as the first two-dimensional form. A concise reference on its geometry, symbolic meanings, and role in creative practice.
Triangle — The First Shape
The triangle is the first polygon — the first two-dimensional shape. Two points connected by a line create only one dimension. But once we connect three points, we gain both height and width — and with that, we enter the world of shapes. My focus is mainly on regular forms, as they serve as the foundation for unfolding patterns and ornamental systems. Sacred geometry, in turn, explains why these forms are considered the building blocks of the universe. I’ll return to this idea often as the blog unfolds.
For any polygon, the sum of exterior angles is always 360°
The regular triangle can tile space on its own (think of triangular mosaics). Only three regular shapes can do this: the triangle, square, and hexagon
Three of the five Platonic solids are made entirely of regular triangles: the Tetrahedron, Octahedron, and Icosahedron — more on these soon
Common symbolic associations across traditions:
A triangle in its static position (base down) symbolizes fire, stability, and the masculine principle
In its dynamic position (pointing down), it represents water and the feminine nature
With its three sides and three angles, the triangle often stands for trinity — sky-earth-human, body-soul-spirit, past-present-future, or the Holy Trinity
In alchemy, an upright triangle represents fire (and air when crossed with a line), while the downward triangle symbolizes water (and earth when crossed) — I’ll explore this more in a future post
The triangle in a circle is the alpha and omega of regular geometric forms — why, will become clear in the article about the Circle
The triangle with an eye is the Christian symbol of God’s omniscience
The Radiant Delta, or triangle with a shining eye, is a Masonic symbol representing the Great Architect of the Universe
I’ll also write separately about the Triquetra (three-lobed knot), another triangle-based symbol
How to construct a regular triangle using a compass, and straightedge in the video bellow:
The video below shows how to construct a triangular grid. But it's worth noting that beyond ornamental design — a topic I'll return to often — the triangular grid appears in architecture, 3D modelling, and even geodesy: wherever structural rigidity or even distribution matters.