Origami Checkerboard


#15

Legend
Valley folding
Mountain folding
0.
  \  ↑
 □□□□
 □□□□
 □□□□\
 □□□□
1.
↓
 □□\ 
 □□□\
 □□□□
 □□□□
2.
    
 ■■□\
 □□□□ 
 □□□□
     ↓
3.
    
 ■■□\
 □□□□
 □□□□
     ←
4.
 ■■□
 □□■
 □□□

Nov 23, 2004 by k16@chiba.email.ne.jp