The gradient on the orange and green are different.
so when they are put under the blue and the red there is a small gap between them.
this small gap makes up for the missing square.
I agree 100% with ioniser
it’s an old trick Look at the slopes of the various lines and they do not match… The thickness of the lines hide this, and so the illusion is created most noticeable between red & green
Or nerdier…
The top rectangle is split at an angle by drawing a line through a 3 by 8 box. The second rectangle is split at angle drawn through a 2 by 5 box.
3/8 = 0.375
2/5 = 0.4
The angles created are slightly different, but enough to make up for one more square unit.
The geek in me is feeling very much at home in these comments.
Is there a name for this? My GF is a math teacher and wants to find this on google. (Our stupid filter at school won’t let us on THIS site!)
Shaupeen, it’s not a video, it’s an animated gif image. Simply right-click on it above, save to your computer and then email it to yourself. Problem solved.
Shaupeen, why don’t you just right-click the image and save it to your computer
The gradient on the orange and green are different.
so when they are put under the blue and the red there is a small gap between them.
this small gap makes up for the missing square.
I agree 100% with ioniser
it’s an old trick Look at the slopes of the various lines and they do not match… The thickness of the lines hide this, and so the illusion is created most noticeable between red & green
Or nerdier…
The top rectangle is split at an angle by drawing a line through a 3 by 8 box. The second rectangle is split at angle drawn through a 2 by 5 box.
3/8 = 0.375
2/5 = 0.4
The angles created are slightly different, but enough to make up for one more square unit.
The geek in me is feeling very much at home in these comments.
Is there a name for this? My GF is a math teacher and wants to find this on google. (Our stupid filter at school won’t let us on THIS site!)
And she liked the video, but loved the comments!!
Shaupeen it is on Youtube here http://www.youtube.com/watch?v=QTxQDjGQh-0 or here http://www.youtube.com/watch?v=7hHZr91XWbw or Google “64 65 geometry paradox” hope this helps
Cheers Jon
Shaupeen, it’s not a video, it’s an animated gif image. Simply right-click on it above, save to your computer and then email it to yourself. Problem solved.
Shaupeen, why don’t you just right-click the image and save it to your computer