Kraul Glass Sphere – Exploring Optics Through Water & Light

The Kraul Glass Sphere is a beautifully simple optics exploration tool that invites children to discover how light, water and perspective interact. Made from blown glass, the sphere transforms into a magnifying lens when partially or completely filled with water, revealing surprising visual effects through hands-on experimentation.

As children fill the sphere with different amounts of water, the world seen through it changes. Objects may appear enlarged, reduced, flipped upside down or distorted in unexpected ways. When held under water with a large air bubble inside, the sphere creates further fascinating transformations, encouraging careful observation and curiosity.

Through these simple experiments, children begin to understand key optical principles — how a magnifying glass works, how lenses focus light, and how reflections and prism-like effects can occur. The shifting images and intermediate stages make each exploration feel new and engaging, inviting children to return again and again.

Made in Germany by family-run brand Kraul, this thoughtful STEM learning tool supports calm, focused play and is particularly suited to home learning environments, classrooms and quiet discovery spaces.

Learning Through Play

The Kraul Glass Sphere supports:

• Early understanding of optics and magnification

• Observation and scientific thinking

• Visual perception and spatial awareness

• Sensory exploration through light and water

Its open-ended nature allows children to explore at their own pace, discovering cause and effect through real materials.

What’s Included

• Glass sphere suitable for filling with water
•  Material: Glass
  Made in: Germany
• 8,3 x 8,3 x 6 cm

Safety & Age Guidance

• Recommended for ages 8 years+

• Younger children may use with adult supervision

• Not suitable for children under 3 years

• Fragile – will break if dropped onto a hard surface

Why We Love It at Magic Forest Shop

At Magic Forest Shop, we value toys that encourage stillness, attention and meaningful discovery. The Kraul Glass Sphere offers a beautiful way for children to explore science through observation, curiosity and wonder,  using real materials and natural light rather than screens.

We ship worldwide. International shipping options are available at checkout.