2002 Barbury Castle formation
|
Reconstruction of the 2002 Barbury Castle formation | ||
| 1. |
| Draw a circle. |
| 2. |
| Draw the right half of the horizontal centerline (ray nr. 0). |
| 3. |
| Copy line 2 (ray nr. 0) 23 times (24 in total) and divide all rays evenly around circle 1. |
| 4. |
| Construct a circle tangent to circle 1 at the inner side, tangent to line 2 (ray nr. 0), and tangent to ray nr. 1 (counted counterclockwise). |
| 5. |
| Construct a circle concentric to circle 1, passing through the center of circle 4. |
| 6. |
| Construct a circle with its center on the vertical ray up (nr. 6), passing through the center of circle 1 and tangent to circle 5 (at the inner side). |
| 7. |
| Copy circle 6 5 times (6 in total) and divide all six evenly around circle 1 (with centers on every fourth ray). |
| 8. |
| Construct a circle concentric to circle 6, tangent to circle 1 (at the inner side). |
| 9. |
| Copy circle 8 5 times (6 in total) and divide all six evenly around circle 1. |
| 10. |
| Copy circle 6 to the center of circle 1. |
| 11. |
| Copy circle 6 another time, to the intersection of circle 10 and ray nr. 7, as shown. |
| 12. |
| Copy circle 11 5 times (6 in total) and divide all six evenly around circle 1 (with centers on every fourth ray). |
| 13. |
| Copy circle 8 two times, to the center of circle 11 (on ray nr. 7), and to the center of the upper right circle 7 (on ray nr. 2). |
| 14. |
| Copy circle 8 another time to the upper right intersection of circles 13. |
| 15. |
| Copy circle 14 5 times (6 in total) and divide all six evenly around circle 1. |
| 16. |
| Copy circle 1 to the end-point of line 2 (ray nr. 0). |
| 17. |
| Copy circle 16 5 times (6 in total) and divide all six evenly around circle 1. |
| 18. |
| Copy circle 5 to the center of circle 16. |
| 19. |
| Copy circle 18 5 times (6 in total) and divide all six evenly around circle 1. |
| 20. |
| Copy circle 1 another time to the upper right intersection of circle 16 and upper right circle 17. |
| 21. |
| Copy circle 20 5 times (6 in total) and divide all six evenly around circle 1. |
| 22. |
| Extend rays nrs. 0 and 6 until they intersect circles 15 (upper right) and 14, respectively. |
| 23. |
| Copy circle 6 two more times, to the end-points of both extended rays 22. |
| 24. |
| Construct a circle concentric to circle 1, tangent to circle 23 on the right, at the right side. |
| 25. |
| Construct a circle concentric to circle 1, tangent to upper circle 23, at the upper side. |
| 26. |
| Circles 1, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 24, and 25 are all needed to finish the reconstruction. |
| 27. |
| Cut away all parts of circles 16, 20 and 25, and circles 1, 17 (upper right) and 18, respectively, until two "islands" remain, as shown (shaded). |
| 28. |
| Do the same for circles 5, 9 (lower right) and 15 (right), and circles 7 (lower right), 10 and 12 (upper right), until two smaller "islands" remain, as shown (shaded). |
| 29. |
| Repeat steps 27 and 28 for all other corresponding circles. |
| 30. |
| Colouring all "islands" green, corresponding to standing crop... |
| 30. |
| ...or just the opposite, colouring flattened crop, finishes the reconstruction of the 2002 Barbury Castle formation. |
| 31. |
| The final result, matched with the aerial image, shows that it does not fit precisely everywhere. |
| Copyright © 2002, Zef Damen, The Netherlands |
