Copyright 1998-2017 Yoshiaki Yoneda
Petaloids, transformed from stamens and pistil by the duplicated gene, project up from the central stand of a cup flower.  
This flower may be said to have a two-story structure.  This is called twice-flowering (Nidozaki or Dozaki).   
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 1 x 1 |  4 x 4 | |
|  2 x 2 | ||
|  8 x 8 |  16 x 16 | 
1 x 1 (thumbnail images) : For indexing 2 x 2, 4 x 4, 8 x 8 : For viewing on monitor 8 x 8, 16 x 16 : For printing