In Rechthoek, trapezium en driehoeken, vibrant colors dominate the canvas, creating a dynamic interplay of shapes. The painting features geometric forms such as rectangles, trapeziums, and triangles, arranged in a seemingly chaotic yet harmonious manner. The use of bold colors enhances the visual impact, drawing the viewer's attention.

The overall composition feels energetic and modern, reflecting the artistic trends of its time. The painting is executed in oil on canvas, a medium that allows for rich color saturation and texture. The geometric shapes are defined by sharp lines and contrasting colors, typical of Cubism. Viewers can observe the meticulous arrangement of forms, which creates a sense of depth and movement.

The dimensions of the artwork are approximately 60 x 80 cm, making it a medium-sized piece that can be appreciated up close. Alfred Ost was a Belgian painter known for his contributions to abstract art in the early 20th century. Rechthoek, trapezium en driehoeken exemplifies his exploration of geometric abstraction, a departure from traditional representational art. An interesting fact about this work is that it reflects the influence of Cubism, which was gaining popularity during Ost's career.

This painting showcases his ability to blend color and form in innovative ways.