Construct the intersection of the cylinder
(x - 0.5) and the sphere x |

Construct the part of the cylinder
(x - 0.5) lying inside the sphere x |

Construct this model of the "icecream": | ||

Construct this model of the "icecream": |

Construct the portion enclosed by the surfaces
z = -x and z = y |

Construct three disjoint rings each encloses the other two. |

Construct these
Borromean rings. ¡@ ¡@ |