Stair Sections

Above: Supportive

Below: Infinity

Above: One

Below: Infinity

The last section drawing of the model, I have changed the bottom drawing which was sprial image, I have placed that image in side way to give the image that I have drawn above.

The reason that I have changed the shape in a side way is to give strong relationship to the word that I have used, 'infinity'. By putting it on the side it will help me to build up the stairs that goes under like endless that we do not know where the bottom is.
The top image is my sketchup model with stairs placed in it.
Both images show front and side section view of the model.