museums and institutions:
Attributed works:
23. Image of a heron facing right, detail of Fig.28 (Photograph Dirk Weber)
Attributed works:
24. Georg Friedel's initials with a six-pointed star, detail of Fig.28 (Photograph Dirk Weber)
Attributed works:
25. Marcus Heiden's initials with a heron facing left, engraved on a turned ivory artefact (Staatliche Kunstsammlungen, Dresden, Grünes Gewölbe, inv. no.II 233; photograph Michael Wagner)
Attributed works:
26. Contrefait sphere, presumably by Johannes Eisenberg and Marcus Heiden. Between 1618 and 1631 (Museo degli Argenti, Palazzo Pitti, Florence, inv. Bargello 1879, no.135; photograph Massimo Listri)
Attributed works:
27. Five snuffboxes turned within a sphere. From N. Grollier de Servière: Recueil d'ouvrages curieux de mathematique et la mechanique, on description du cabinet de monsieur Grollier de Servière, 2nd ed., Paris 1751, pl.IV
Attributed works:
28. Contrefait sphere, by Georg Friedel. Before 1618 (Staatliche Kunstsammlungen Dresden, Grünes Gewölbe, inv. no.II 256; photograph Jürgen Lösel)
Attributed works:
29. A pair of interlocking spheres inside a sphere turned from a single block of ivory. From L.-E. Bergeron: Manuel du tourneur, 2nd ed., ed. P. Hamelin-Bergeron, Paris 1816, II, pl.XXIV
Attributed works:
30. The goblet with lid by Georg Friedel, shown in Fig.31, as it appeared in 1932. From J.L. Sponsel and E. Haenel: Das Grüne Gewölbe zu Dresden, Leipzig 1932, IV, pl.4, detail
Attributed works:
31. Goblet with lid, by Georg Friedel. Before 1618 (Staatliche Kunstsammlungen Dresden, Grünes Gewölbe, inv. no.II 297; photograph Jürgen Lösel)
Attributed works:
33. Goblet with lid, presumably by Johannes Eisenberg and Marcus Heiden. Between 1618 and 1631 (Museo degli Argenti, Palazzo Pitti, Florence, inv. Bargello 1879 no.56; photograph Massimo Listri)
Attributed works:
34. Detail of Fig.31 (Photograph Jürgen Lösel)
Attributed works:
35. Detail of Fig.28, two multi-layer balls turned within the hollow sphere (Photograph Michael Wagner)
Attributed works:
36. A regular octahedron where each face is subdivided into three equal kites (deltoids). From W. Jamnitzer: Perspectiva Corporum Regularium, Nuremberg 1568, p.E.V.
Western art unattributed:
22. Stamp seal of the market town of Essing. Sixteenth century (Germanisches Nationalmuseum, Nuremberg, inv. no.SiSt 178; photograph Monika Runge)
Western art unattributed:
32. Multi-layer ball, artist unknown. Probably first half of the seventeenth century (Historisches Museum, Frankfurt, inv. no.hmf.X23737; photograph Uwe Dettmar)
