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Josip
19-05-2007, 10:45 AM
Hi, all :)

For free time....;)

Best regards, Josip :)
Brian_UK
19-05-2007, 11:57 AM
Now, that's annoying.
The Viking
19-05-2007, 12:07 PM
+1

Ok, I'll give up, how's it done?
monkey spanners
19-05-2007, 12:23 PM
Does any body remember the film "forbiden planet" with robby the robot and when he was told to shoot someone, his little robot brain went zzzgrrrzzzggrrr. same effect trying to work it out.
BigJon3475
19-05-2007, 02:57 PM
39 total and partial squares used in the top one.....38 in the bottom.....it's partials that make up the whole missing piece.
chillin out
19-05-2007, 06:04 PM
It's to do with the angles of the 2 triangles.

The small one is 1:2.5
The big one is 1:2.666

Chillin:) :)
BigJon3475
19-05-2007, 08:29 PM
Four sided not a triangle. It has a protrusion in the bottom picture. It's just slightly off......it's also from the 1950's:D Curry's paradox
BigJon3475
19-05-2007, 08:37 PM
Find the black dot....




http://i68.photobucket.com/albums/i25/BigJon3475/320px-Grid_illusion.png
chiller-man
19-05-2007, 08:46 PM
Bigjon, this is messing my brain up!
and I've only had one glass of wine!
Josip
19-05-2007, 09:07 PM
Hi,

Not too many answers;), but for sure something to read about in free time....about paradox

Look for answers here...

http://www.seed.slb.com/en/scictr/lab/math/jun03.htm

http://www.mathematik.uni-bielefeld.de/~sillke/PUZZLES/jigsaw-paradox.html (http://www.mathematik.uni-bielefeld.de/%7Esillke/PUZZLES/jigsaw-paradox.html)

http://www.cut-the-knot.org/Generalization/CevaPlus.shtml#bam

Find a black dot....or

Is the Visual World a Grand Illusion?

http://mathworld.wolfram.com/ScintillatingGridIllusion.html

http://mathworld.wolfram.com/HermannGridIllusion.html

Best regards, Josip :)
BigJon3475
19-05-2007, 09:56 PM
:D Wiki was my friend on this one :D Definetly worth the fun though...I like things like this...

http://en.wikipedia.org/wiki/Missing_square_puzzle

http://en.wikipedia.org/wiki/Optical_illusion
Andy P
20-05-2007, 03:01 PM
Find the black dot....




http://i68.photobucket.com/albums/i25/BigJon3475/320px-Grid_illusion.png

They're not black; they are dark red - or is it my eyes that are messed up!?


Tartan for a Dunfermline fan!!

cheers

Andy P
marc5180
20-05-2007, 08:04 PM
the black dots are all over can you not see them?
expat
28-05-2007, 07:21 PM
No no no they're black squares
Contactor
28-05-2007, 10:14 PM
There are no black dots, try covering up all but the 'dot' and you will see.
BigJon3475
28-05-2007, 10:36 PM
There are no black dots, try covering up all but the 'dot' and you will see.


My 102 blank pieces of paper aren't working to well :D all I see is white...