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Horned sphere (fat) 3d printed

DIGITAL PREVIEW
Not a Photo

White Strong & Flexible
Horned sphere (fat) 3d printed
Horned sphere (fat) 3d printed

DIGITAL PREVIEW
Not a Photo

Horned sphere (fat)

Made by
$63.30
3D printed in white nylon plastic with a matte finish and slight grainy feel.
QTY
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Product Description
The Alexander horned sphere is a topological shape whose interior is equivalent to the inside of a ball, but the outside is not equivalent to the outside of a ball.
For example, you can contract a loop in the outside of a ball, but not in the outside of the horned sphere if the loop goes around the handle. However, with this approximation of the horned sphere, you can contract the loop because it branches only finitely many times. So here is a puzzle game that will test your patience and give you an intuitive understanding why it is impossible to contract the loop in the ideal case: Tie a thread around the big handle and try to free it by maneuvering it through the branches.

If this product is too expensive for you, try the less fat version, also available in my shop.
Details
What's in the box:
Horned sphere (fat)
Dimensions:
14.27 x 11.34 x 3.71 cm
Switch to inches
5.62 x 4.46 x 1.46 inches
Switch to cm
Success Rate:
First To try.
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Rating:
Mature audiences only.
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