f57v and the Catalan Atlas

[Koen G]

Might the "blob" on the rosettes foldout be something else than the one in the centre of the diagram, then? There are other images where a lobed shape with stars and a marked centre is meant for the celestial pole. 

   

Men observing the stars, from Bartholomaeus Anglicus' De Proprietatibus rerum, Italy (Mantua), c. 1300-1310, You are not allowed to view links. Register or Login to view., f. 108v