The Bonan-Jeener double bottle described by means of a Bidimensional Hilbert Curve -iteration 7- [La double bouteille de Bonan-Jeener décrite à l'aide d'une courbe de Hilbert bidimensionnelle -itération 7-].
See the Bidimensional Hilbert Curve -iteration 7-:
See the Bonan-Jeener double bottle:
See some related pictures (possibly including this one):
See some related pictures (possibly including this one):