Bernini's Baldachin, Saint Peter's Basilica, Vatican City

Photograph Copyright ©2012 Loo Yen Yeo. All Rights Reserved.

Concept: Placement (secondary point of interest); Placement (subject vector); Triangles (vertical convergence)

Description: Gianlorenzo Bernini's baldacchino towers twenty metres over the main altar, and yet is dwarfed by Michelangelo's dome more than a hundred metres above it. This shot captures the detail of Bernini's design - the helical columns based on the legend of those from Solomon's temple, and the flaring dove of the Holy Spirit - with heavy use of diagonals to maintain the writhing energy. The dynamic off-centre placement is balanced by the Medallion of Saint John the Evangelist in the spandrel, top-right.

Taken close-up with a wide-angle lens, the helical spin of the bronze columns create a vector upwards to convergence point (the dome's lantern) just out of frame i.e. a vertical triangle was implied to give a sense of scale.

Title: The Dove and the Eagle

03.08 Triangles

A triangle is the simplest shape to establish in composition and yet it is one of the most powerful. All it requires is just three points in the visual field, each becoming a corner of the triangle (excepting when the points lie on a line). Unlike circles or rectangles whose points are highly constrained, a triangle's points enjoy freedom of placement.

A triangle can also be created with a minimum of two convergent lines, the third side being formed by the camera frame. Convergent lines abound in nature, most commonly in linear perspective where planar boundaries meet or imply meeting at the vanishing point.

Composition makes use of triangles as a unifying motif when there is little or no control over the shooting environment - as in reportage photography - to add clarity to a visual presentation.

A triangle is made by:

• implication - three points which the viewer's eye connect to closure
• lateral convergence - the top and bottom boundaries of a vertical plane (e.g. a wall) meeting at a horizon's vanishing point
• vertical convergence - the side boundaries of a vertical plane (e.g. wall), when seen through a wide-angle lens, appear to converge at a vanishing point above the plane.

Triangles can take two forms:

Upward-pointing

Where the baseline is at the bottom/front and apex at the top/back. This orientation is associated with a sense of stability with lightness wrought by the diagonals, as compared to the stable-but-heavy rectangular arrangement.

Downward-pointing
Where the apex is at the bottom/front and baseline at the top/back. The inverted position conveys a feeling of instability, dynamism, aggressiveness and movement.