copy of

MACHINE TRANSLATION (not authorised yet)

Transparent cones connected by vertices and crossed by a vertical plane (colourful, transparent rectangle) showing two hyperbolic cross-sections. Additionally, a sphere is inscribed in each cone. The spheres have different diameter and colour (red and blue), but both are also transparent. On the shape, the points of contact of the balls.
The shape is very carefully made by a German company specializing only in the production of shapes for education.
The height of the whole didactic aid: 23.5 cm.