This asymmetrical sculpture comes full circle over 36 brick layers.
First devised the instructions for a quarter circle, these can be found at the bottom of this page (LDRAW-instructions).
About this creation
1. THREE FULL ROTATIONS ( 108 layers )
( this is the final sculpture standing 103cm / 3ft5 and uses just over 4000 bricks
I repeated the LDR-instructions a dozen times. )
2. LDRAW INSTRUCTIONS
(downloadable at bottom of this page)
Parts list for this L-DRAW 9 layers ( 90° ):
Green 1 x 1 : 9
Green 1 x 2 : 15
Green 1 x 3 : 13
Green 1 x 4 : 32
Green 1 x 6 : 2
Green 2 x 4 : 54
Green 2 x 3 : 17
Green 2 x 2 : 13
Red 1 x 4 : 41
Red 1 x 1 : 11
Red 1 x 2 : 20
Red 1 x 6 : 2
Red 2 x 6 : 2
Red 1 x 3 : 22
Red 1 x 8 : 2
Red 2 x 2 : 14
Red 2 x 3 : 19
Red 2 x 4 : 49
TOTAL : 337 bricks
25-30 minutes to build
3. METHOD TO THE MADNESS
Basically I took this monochrome picture of a bone ( I encourage you to try with other shapes such as Bat logo, an hour glass, ... ) :
did 9 rotations of ten degrees each ( the last layer being identical to the first, rotated 90° ).
Made the images really tiny, so every pixel would represent exactly 1 stud.
Color transition was estimated on sight ( what line would cut each layer in half ).
Finally this resulted in ...
4. MY HANDCRAFTED INSTRUCTIONS
I find it hard in LDRAW to read building instructions so you can download these 10 .jpg images if you want a clear view
5. ONE FULL ROTATION ( 36 layers )
5. FINAL REMARKS
Building a sculpture according to these plans of a partially hollow double helix has it buts especially when it comes to moving the sculpture once it has been built.
I found out that moving this sculpture around was feasible when it stood two rotations high; three however is too much ! When i lifted it the first time to make some pictures it broke in three. The main problem is the combined weight on the lower layers ( some cavities there due to hollow layers ) together with a flexible 16x32 base plate.
So if you are aiming for the skies I recommend to build in full layers, certainly for the first half of your moc.
Quoting Lego Ranker
It seems and looks nice. I wonder if it be strong enough to support a small house. It be like the staircase to the house, above the world.
I'm positive it is strong enough to support a small house, provided there are no internal cavities. Also would be a great idea to recreate this spiral with the Ldraw instructions, but use all plates instead. I'd really love to see someone give this a shot, with a house or even better, a small castle tower or gates of heaven at the end of the stairs.