Solution
The problem of this contest was to draw a tesseract:
(Each color represents one dimension.)
This image was created by 4d-3d-projection software (which is basically similar to 3d-2d-projection as used in most software to show a 3d image on your 2d screen.).
As you can see the image consists of 2 cubes(drawn in red, green, blue) which are connected at the corners in yellow lines.
Depending on the perspective and what kind of projection(perspective or orthogonal) are used even images similar to what 
↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓
List of participants with their entries:
| Name | solutions found | comment |
|---|---|---|
| @golddeck | A good example of how hard it is to think in higher dimensions. | |
 @ninahaskin |
↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓
Winner draw:
Congratulations
I also want to award
↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓↑↓