how to draw a 3d optical illusion with pencil
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Lesson Details
How-do-you-do, this is Ethan Nguyen for My Drawing Tutorials.com and in this video, I'm going to show you how to draw a 3D hole optical illusion. Here's what the illusion volition look like. 
Now allow me show you how I did it.
Step one – Drawing the Ellipses
The beginning footstep is to draw a big ellipse. The residue of the drawing will be done in ink, just I will depict this first ellipse in pencil because nosotros volition be erasing it after. 
Next, depict a smaller ellipse inside the first one using ink. You'll want to make this one slightly shorter and more rounded. And instead of placing it right in the center, motility it down slightly. 
By the way, I made a light pencil sketching of the entire drawing before paw and is now simply going over it with ink. That fashion, the drawing process volition be a lot smoother and you won't have to come across me erasing and re-drawing a bunch of times. Only when you're drawing this yourself, don't exist agape to alter things around a bunch of times to become the curves merely right. And then draw another smaller ellipse within this one. Once again, you'll want to make it more rounded and place it closer towards the bottom. 
Echo this procedure 3 more than times. 
Yous can see the pattern very conspicuously here. Each ellipse is a little more like a circumvolve and they group together at a single betoken.
Footstep 2 – Cartoon the Tiles
Next, we're going to draw some straight lines from the eye outward. 
The gaps between these lines will exist widest at the bottom and gradually narrow as they movement upwards. To help planing out the spacing and make them more consistent, I like to start at both ends at the same time. That way I'll take a adept idea of how wide the stripes at the peak will be and program accordingly. 
One important detail is to make sure you cease up with an even number of stripes. You'll see why this is important in a minute. In one case we accept all the stripes drawing in, allow's erase the outer almost circle. 
Stride 3 – Inking and Shading
Now, we'll use a sharpie marker to fill in the outer circle using an alternating pattern. This is why information technology's of import to have a even number of stripes. If the stripes were odd, it would throw the design out of sync. 
The large sharpie marker won't be able to color in the squares all the way to the edge, so nosotros'll merely become as close to the edge as we can for at present. Continue doing this for all the circles. 
Now, let'due south take a smaller pen and fill in the minor gaps that we couldn't get with the larger marking. 
The last footstep is to create a dark gradation at the heart hole. I'll apply a 9xxb graphite pencil to put in a base tone. You too can use a 4B or 6B pencil for this. 
And I'll use a blending stump to shine out the tone. 
And now I'll use a charcoal pencil to put in a really night layer for the pigsty. 
And that'southward information technology! At present all nosotros have to do is look at this drawing at an angle to see the 3D optical illusion.
Source: https://mydrawingtutorials.com/how-to-draw-a-3d-hole-optical-illusion/
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