Optical Illusion

**salaam** · 12 August 2006, 05:37 PM

Thanks Remi,
Although it is very easy using X3D with X1 'intersect shapes'. I tried creating your first post in X3D, impossible I think. Too many impossible perspectives .

Originally Posted by parahandy

Parahandy he say." use brain, look at the picture with a mirror five or so feet away"

I've measured the distance between this screen and the book shelf, it is 4 feet. I think that my cut and paste method is quicker anyway.
Nice gag Parahandy but indirect but you still retain the title.

Dimitry, I think I may need a clue to your photo.

Anas

**parahandy** · 12 August 2006, 06:01 PM

Originally Posted by Intbel

Possibly a guy in a skiff by a jetty?

try turning picture 90 degrees

**Intbel** · 12 August 2006, 06:21 PM

> sigh < I think I'll go play mando for a while ...

**parahandy** · 12 August 2006, 07:01 PM

Originally Posted by Intbel

> sigh < I think I'll go play mando for a while ...

Ok, you saw it first. Strum away.

**remi** · 21 October 2006, 02:53 PM

A variation of the first "illusionary" post.

**remi** · 20 January 2008, 10:48 PM

In this picture the crossbars seems to be wedge-shaped. But in reality the shapes are equal rectangles and the lines are parallel.

Click image for larger version.

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see also: Wikipedia article about "Café wall illusion"

Remi

**handrawn** · 20 January 2008, 10:55 PM

intresting - if I squint my eyes part closed so I no longer see the red, I can clearly see the the edges of the squares form parallel lines - open my eyes to normal so I see the red and it all looks squiffy again

**gray** · 20 January 2008, 11:43 PM

Great effects, Remi.

**steve.ledger** · 21 January 2008, 12:08 AM

Nice find Remi.. Now that could make an interesting Chess board!

I had a look at the Wiki link.. Gosh that building must drive the neighbours up the wall!!

wiki:
To construct the illusion, alternating light and dark "bricks" are laid in staggered rows. It is essential for the illusion that each "brick" is surrounded by a layer of "mortar" (the grey in the image). This should ideally be of a colour in between the dark and light colour of the "bricks".

So I too had a play with this in Xara, attached here for anyone who want to play with the colours.

**gwpriester** · 21 January 2008, 10:45 PM

Egg. You slay me. I remember that image. I love the ship making the sharp turns.

Remi - These are really terrific and a great use of Xara. They are very Escheresque.

Gary