Step by step photo,s:

1.valleyfold 2. two valleyfolds

3. 4. Repeat this folds on every side:

5. 6.

7. make a valley fold in every middle to the crosspoint. 8. each point from the paper fold to the middle

9. 10.

11. 12.

13 14

repeat step 13 and 14 8x :

15 16 make valleyfoldsTurn the model:

17 18

Do this 8 times:

19 20

21 22 after this turn the model:

23 24

25 26 Turn:

27 28 the points opened (8x)

29 Done!The model becomes more beautiful if you use thinner paper. Because I heve only thicker paper 20 cm x 20cm I chose this one. My thinner paper is 15cm x 15. You can make the model with 15 x 15 .