How do Wedges function in Painting?

Wedges play a crucial role in the realm of painting, particularly when it comes to adjusting the tension of a canvas. When a canvas is stretched over a wooden frame (stretcher bars), wedges are inserted into the corners of the frame. By tapping these wedges, an artist can increase or decrease the tension of the canvas, ensuring it remains taut. A well-stretched canvas helps prevent sagging and allows for better paint application, contributing to the overall quality of the artwork. This ability to fine-tune the canvas tension is essential for both aesthetic and practical reasons in painting.