Posts Tagged ‘optical illusions quilt’

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20.6 SQ Episode 032 – Optical Illusions

November 6, 2011

Podcast Feed

Optical (visual) illusions come when your brain interprets something you see that you actually don’t see.

Optical Illusions come in many forms

Line (& Shape) Illusions

Lines appear bulged or squished depending on lines around it.

Op-Art Quilts book on Amazon

Op Art on Wikipedia

This looks like the op art quilts in the book but is not exactly:

Orchid Kaleidoscope

Image from flickr by andy02124 (creative commons)

The Cafe Wall Illusion

Image from Wikipedia

Herring Illusion

Image from wikipedia

Herring Illusion variation

There are squares set on point that have concentric circles that make the squares seem squished

The Bulging Checkerboard (see below)

Kaleidoscope quilt variations (this one does not show circles, but is Kaleidoscope quilt

kaleidoscope Quilt

Image from flickr by heidielliot(creative commons)

Storm at Sea

Storm At Sea

Image from flickr by The Last Cookie

Dimensional Illusions

Due to colors/ value lines, two dimensional objects appear in three dimensions

2D –> 3D

Vasarely Budapest Déli pályaudvar

Tumbling block and varations

Shadow box quilt

Movement Illusions

Due to highly dense & colored designs, the designs appear to move on you.

Revolving CirclesImage from Wikipedia

A dizzying optical illusion quilt that you won’t be disappointed to see, but watch, made me dizzy to look at.

Rotating Snake Illusion (very moving, if you’re epileptic, be aware before clicking)

Fraser Spiral

Image from wikipedia

Actually moving illusion that induces an interesting afterimage effect (don’t go if epileptic)

Illusion of Inclusion

Your brain completes the picture, it finishes things up that are not there.

Kansia Triangle

Image from wikipedia

Ambiguous Objects

Duck and Rabbit

Two Faces & Vase

Image from wikipedia

Robbing Peter to Pay Paul

1997 Robbing Peter to pay Paul

Image from flickr by PeggyinMaine

Paradoxical Drawings

These objects are impossible … very impossible.

Penrose Triangle

Image from Wikipedia

MC Escher stairs

Penrose stairs

This hilarious video of these penrose stairs. Video is called Hallucii.  You’ll see why when you click.

Secondary Patterns

Patterns come up that are not expected – from very simple blocks

The Neutral Stars Block

The simple three strip block that doesn’t look like much on its own.

More about the Bulging Checkerboard

Jane’s wonderful optical illusion quilt has stuck in my mind over the last year, when I would see it on her blog, I remember thinking, wow, what a quilt.

She has graciously agreed to let me share pictures of it with you.

Jane has named her quilt False Impressions, the website of this effect is called bulging checkerboard.

The effect is simply amazing, but the execution of it looks like squares on larger squares.  The hardest part would appear to be keeping everything separate and in line.

Here is a detail shot.  It would be easy to do with big enough blocks, the effect is much greater when standing back.

Do you see why it’s a bulging checkerboard?

Jane has discussed this quilt in several different posts, and in the latest post has talked even more about optical illusions for quilt ideas.

Wow, this quilt, I would be really proud of Jane.

Jane calls herself a quilter geek, and this is a great example of this.

Other Optical Quilts

3D Tetris Quilt by Quilter Geek

My Tumbling Block Table Runner

My Opic by Ruthann from Mirkwood Designs (link from SeamedUp, tell me if it’s broken)

Who is known as the Optical Illusion Quilter?

Karen Combs (facebook page)

Optical Illusion Quilts on amazon

Optical Illusion quilts at the Online Quilt Museum

Further Links

Links to the Wikipedia site on Optical Illusions & Geometrical Optical Illusions.

Whole site of Illusions at Visual Phenomena & Optical Illusions

I did not discuss color constancy, which is a whole other ball of wax that tricks your brain into thinking about the colors based on the other colors around it.

Additional music

Mevios Music Alley: Get Myself Together by The Tones

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