how to draw a optical illusion 3d
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Hi, this is Ethan Nguyen for My Drawing Tutorials.com and in this video, I'm going to show yous how to draw a 3D pigsty optical illusion. Here's what the illusion volition look like. 
Now let me show you how I did it.
Stride 1 – Cartoon the Ellipses
The first pace is to draw a big ellipse. The rest of the drawing volition be done in ink, just I will draw this start ellipse in pencil because we volition exist erasing information technology later. 
Next, depict a smaller ellipse inside the first one using ink. Yous'll desire to make this 1 slightly shorter and more rounded. And instead of placing it right in the center, move information technology downwardly slightly. 
By the way, I made a light pencil sketching of the entire cartoon before hand and is now simply going over information technology with ink. That style, the cartoon process will be a lot smoother and you won't have to see me erasing and re-drawing a agglomeration of times. Only when you're cartoon this yourself, don't be afraid to change things effectually a bunch of times to get the curves merely correct. Then draw another smaller ellipse inside this one. Once again, you lot'll want to make information technology more rounded and place it closer towards the lesser. 
Repeat this process three more times. 
You can run into the pattern very clearly here. Each ellipse is a lilliputian more than similar a circumvolve and they group together at a single point.
Step ii – Cartoon the Tiles
Adjacent, we're going to describe some straight lines from the center outward. 
The gaps between these lines will exist widest at the bottom and gradually narrow as they move upwards. To help planing out the spacing and make them more consequent, I like to start at both ends at the same time. That way I'll have a good thought of how broad the stripes at the top will be and plan appropriately. 
1 important particular is to make sure yous end upwardly with an even number of stripes. Y'all'll see why this is important in a infinitesimal. One time we have all the stripes drawing in, permit'south erase the outer most circle. 
Step 3 – Inking and Shading
Now, we'll use a sharpie marking to fill in the outer circle using an alternating design. This is why it'south important to have a even number of stripes. If the stripes were odd, it would throw the pattern out of sync. 
The large sharpie marker won't be able to color in the squares all the mode to the edge, so nosotros'll just get equally shut to the edge as we can for now. Keep doing this for all the circles. 
Now, allow's take a smaller pen and make full in the small gaps that we couldn't become with the larger mark. 
The terminal footstep is to create a night gradation at the center hole. I'll use a 9xxb graphite pencil to put in a base of operations tone. You lot besides can use a 4B or 6B pencil for this. 
And I'll apply a blending stump to smooth out the tone. 
And now I'll utilize a charcoal pencil to put in a really dark layer for the hole. 
And that's information technology! At present all we have to do is look at this cartoon at an angle to come across the 3D optical illusion.
Source: https://mydrawingtutorials.com/how-to-draw-a-3d-hole-optical-illusion/
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