What is the oldest and simplest construction method in architecture?

The oldest and simplest construction method in architecture is the use of post-and-beam construction, also known as timber framing. This technique involves erecting a framework of vertical posts and horizontal beams to support a structure, allowing for large open spaces. It dates back to ancient times and can be seen in various cultures worldwide, showcasing its enduring effectiveness and simplicity. The method's basic principle relies on gravity and tension, making it accessible with minimal tools and materials.