Yves Klein's Planetary Reliefs are a captivating exploration of space and texture that continue the artist's engagement with the immaterial and the infinite. These works, created using his iconic International Klein Blue (IKB) alongside other pigments, push the boundaries of traditional relief sculpture by incorporating elements that suggest cosmic and natural forms, resonating with Klein's interest in the ethereal and the boundless.

One notable piece within this series is the "Pink Planetary Relief 'Lune II' [Moon II]," which encapsulates Klein's fascination with celestial bodies and the cosmos. By applying dry pigment and binder on plaster, Klein achieves a stunning visual effect that transcends the physicality of the material, inviting viewers into a meditative space of color and form​ (Yves Klein)​.

The "Yves Klein, infinite blue" exhibition, held at the Bassins de Lumières in Bordeaux, France, from May 19, 2021, to January 2, 2022, provided an immersive experience that highlighted the diversity of Klein's work. This exhibition showcased the Planetary Reliefs among other pieces, offering a comprehensive look at how Klein's work with color, particularly IKB, extended beyond flat surfaces to envelop viewers in an immersive environment of matter and sensitivity. Accompanied by the music of Vivaldi and Thylacine, the exhibition underscored the sensory depth and philosophical breadth of Klein's artistic vision​ (Yves Klein)​.

Klein's Planetary Reliefs reflect his ongoing exploration of the void and the material, embodying his belief in the spiritual and transformative power of art. Through these works, Klein invites us to contemplate the vastness of the universe and our place within it, bridging the gap between the tangible and the intangible.