Final answer:
Structural balance in design includes symmetry along with the consideration of stability and physical arrangement, often seen in architectural structures like the use of arches for support.
Step-by-step explanation:
The question asks about structural balance in design as compared to formal balance, which is characterized by linear symmetry. Structural balance encompasses both symmetry and considerations for the overall stability and arrangement of a piece, most commonly applied to architectural structures. While formal balance involves an even distribution of elements, creating a mirrored or near-mirrored design on either side of an axis, structural balance goes beyond this to include the actual physical stability and weight distribution within a design or structure. This can be seen in the construction of arches or the strategic placement of support elements in a building. Structural balance is achieved when the structure stands secure and stable, without any risk of toppling over due to uneven weight distribution.
An example of structural balance can be seen in the distribution of arches in classical architecture, where they serve the dual purpose of facilitating the passage of people and maintaining the stability of the structure. This is different from the symmetrical balance observed in artwork, like Perugino's painting 'Christ Giving the Keys of the Kingdom to St. Peter', where two sides mirror each other to convey calm and formality. Structural balance, therefore, includes but is not limited to symmetry, taking into account physical considerations that affect a design's functionality.