In Insel im Attersee, Gustav Klimt presents a tranquil landscape featuring an island surrounded by calm waters. The painting is characterized by its vibrant greens and blues, creating a peaceful atmosphere. The lush vegetation and gentle waves suggest a serene day by the lake.

Klimt's use of color and light enhances the natural beauty of the scene. The painting is executed in oil on canvas, showcasing Klimt's signature brushwork and attention to detail. The composition is balanced, with the island positioned centrally, drawing the viewer's eye. Klimt's technique involves layering colors to create depth and texture, evident in the foliage and water.

This work reflects his transition into more naturalistic themes during his career. Gustav Klimt is best known for his decorative and symbolic works, but Insel im Attersee marks a shift towards landscape painting. Created around c. 1900, this piece reflects Klimt's love for nature and the Austrian countryside.

Interestingly, Klimt often painted en plein air, allowing him to capture the essence of his surroundings. This painting is part of the collection at the Belvedere Museum in Vienna.