The Penrose stairs, also known as the impossible staircase, is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop. Although the staircase is conceptually impossible, it does interfere with your perception since it looks like a person could climb forever and never get any higher.

Watching the video is the easiest way to see how it works. I’ve included a drawing which is linked in the video description.

Step 1: Tools/Materials

Tools:

Band Saw
Tape measure
Pencil
Clamps
Sander (optional)

Materials:

Wood 1 x 6 or 1 x 3
Wood glue

Step 2: Cut First Side

Cut wood as shown in the pictures. I used a table saw for the sections and a band saw for the steps.

Step 3: Cut Second Side

Step 4: Cut Third Side

Step 5: Cut Fourth Side

Step 6: Glue Sides Together

Use a vice or clamps

Step 7: It Should Look Like This When Assembled

Step 8: Highlight Edges

Use a pencil or marker to highlight the step edges. You could also paint the steps as an enhancement.

Step 9:

I used a Canon DSLR camera for the photo and video. It took a few minutes on a tripod to line up the angles. I also had to use manual focus to blend the focus which helps with the illusion.