How to draw an optical illusion starts with a simple idea: turning flat lines on paper into visuals that appear to pop, twist, or even move. From its dawn, optical illusions have always fascinated people as they bend the rules of how we see the world and even challenge basic physics. This sense of wonder has made it ever more intriguing to learn how to draw an optical illusion.

Contrary to popular belief, you don’t need fancy tools to create an optical illusion yourself. Even with just a pen and paper, you can make your own. In this blog, we’ve covered:

• What is an optical illusion, and what are the different types
• How to draw an optical illusion

So, let’s buckle up and start this sweet journey together.
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What Is an Optical Illusion?

Before we jump into how to draw an optical illusion step by step, let’s first understand what optical illusions actually are. Simply put, an optical illusion is when we see something that isn’t quite real. Our eyes send information about what is perceived, and our brain interprets it to create a distorted image.

In fact, when we encounter 3D anamorphic art, our brains’ processing tricks us into seeing images that appear different from reality.

Optical illusions are usually grouped into three main types:

1. Literal

This type of optical illusion is created by physical effects like the reflection or refraction of light. If you want to learn how to draw an easy optical illusion, the Ponzo illusion is a great example.

In this illusion, two lines that are actually the same length appear different because of the converging lines around them. Indeed, our brain interprets those lines as representing distance, so we perceive that one line is farther away and therefore longer.

2. Physiological

This one comes from the way our eyes and visual system respond to images. One way to understand how an optical illusion works is by looking at the best examples.

For physiological illusions, the Hermann grid illusion is a proper example. When you look at a grid of black squares separated by white lines, you might notice faint dark spots appearing at the intersections. This happens because of how our eyes process contrast, showing how our visual system is wired.

3. Cognitive

An optical illusion is all about how our brain interprets what we’re seeing. Cognitive illusions, with the same purpose, play with how we interpret the world. One well-known example is the Müller-Lyer illusion, in which two equal lines appear to be different lengths because of arrow-like shapes at their ends. Our brain reads these shapes as depth cues, which trick us into seeing the lines as unequal.

Now that we understand different optical illusion types, it’s time to delve deeper and learn how to draw an optical illusion. So, let’s continue!

How to Draw an Optical Illusion Step by Step

To realize how to draw an optical illusion easily, we’re going to dive into a detailed drawing tutorial for three types of representative illusions:

1. How to Draw an Optical Illusion of Penrose Triangle

Penrose’s impossible triangle is a classic geometric illusion. Indeed, it’s a 2D drawing that looks like a 3D solid triangle with each corner joined impossibly. So, to get the answer to how to draw an optical illusion triangle, you need to follow the instructions carefully.

• Step 1:

Start with an L-shape formed by two thick line segments of equal length meeting at a right angle.

• Step 2:

Extend each segment into a parallelogram by drawing three more segments of equal length, so that all three arms will form the shape.

• Step 3:

Connect the ends: each arm’s end meets another arm at a right angle, forming the loop.

• Step 4:

Erase or hide the construction lines that conflict. Notably, where edges cross, pick the edges that would appear in front and remove the hidden portions.

• Step 5:

Shade or tone the three outer faces consistently, typically one face light, two faces darker, to reinforce the 3D effect. A key trick is that the corner rules of 3D are broken. Now, the brain is tricked by the line placement into seeing continuous edges.

One tip: Use a ruler for all edges; be patient and precise. Coordinate shading so that edges that should be at the same depth share tone, darker where shadowed. This makes the shape seem solid even though it cannot exist.

2. How to Draw an Optical Illusion of Penrose Stairs

This is an instruction to the Penrose impossible staircase. Each stair loop ascends yet returns to the start, and this is an endless staircase that loops back on itself, which is created by violating perspective rules. To find out how to draw an optical illusion for this example, follow the steps below.

• Step 1:

Draw a tilted square loop, like drawing a continuous belt with four corners.

• Step 2:

Then, at each corner, draw a short step segment extending inward.

• Step 3:

Connect those inner step ends around the loop, forming a rectangle of steps on top.

• Step 4:

Erase interior guidelines so that each corner joins the next seamlessly. The perspective is false. This is because every turn makes a 90° angle, but overall, the stairs ascend infinitely. To draw it, one often imagines a cube-like framework and then scrambles which edges connect.

3. How to Draw an Optical Illusion of An Ames Room

An Ames Room illusion is a trapezoidal distorted space that makes people of the same size look very different in size.

• Step 1:

Decide on a vanishing point on the horizon.

• Step 2:

Draw the room’s outline as a trapezoid: one back wall corner is much farther (taller) than the opposite corner, but both walls converge toward the viewer’s perspective.

• Step 3:

Add floor and ceiling lines to that vanishing point; they will appear distorted, one side foreshortened.

• Step 4:

Draw two identical figures or objects on these floors: one in the far corner, one in the near corner.

The Ames Room illusion is often used in theme park design ideas to engage visitors or educate them about optical illusions.

It is worth mentioning that there are 5 more types of optical illusions to help you wrap your head around the creation process. One of which is an anamorphic sidewalk chalk art with distorted-perspective illusions, which is appropriate for learning how to draw an optical illusion hole. So, it requires careful grid work.

Another form is the Moiré pattern, which is created by overlapping repeating patterns. Drawing a basic moiré pattern can help you understand how to draw an optical-illusion circle.

Last Words on How to Draw an Optical Illusion

The key to creating an optical illusion is to understand how our brains perceive things and use that understanding to your advantage. Once you practice shading and perspective, you’ll be able to create everything from 3D holes to impossible shapes.

At SALSO Design, we offer a wide variety of optical illusions, customizable to decorate your space or launch your campaign. Our team, led by a professional illusion designer, Saleh Solhandan, is ready to answer your questions or help with your 3D projects! Make sure to visit our portfolio to learn more about what we do and how we can help!

FAQs about How to Draw an Easy Optical Illusion

Let’s see the most common questions about how to draw an optical illusion.