# Re: physics trick

From: Michael Lorrey (mike@datamann.com)
Date: Mon Jan 22 2001 - 11:43:33 MST

I was under the impression they were squares of color, not actual
letters. Lower resolution images tend to appear lighter than higher
resolution images. A mixture of colors increases resolution to either
the atomic scale, or the top discernable by the human eye, while the
tile will appear lighter until you stand far enough away that the size
of each square is less than or equal to the finest resolution of the
human eye.

Ifrit wrote:
>
> Take the proportion of size of H to O and those are the percentage colors
> straight out. Don't forget to factor in the white background as
> well. Both canvases should be very close to the same color.
>
> Verified with a crude representation, on paper, not many x's, h's or o's,
> as was all I had time to do. If someone actually has canvases and wants
> to try this...but at any rate they both looked the same to me.
>
> Important notes to remember if trying this: Both must have the same
> background, be at the same angle relative to the eye, have a centralized
> light source so equal illumination.
>
> It might also be good to do this through two cardboard tubes held up to
> the eye so that one can only see the canvas' design pattern.
>
> Another question though. Do the choice of colors matter? If one mixed
> something such as red and green, or any two 'opposite' (don't remember the
> word, like red-green, purple-yellow, blue-orange) the ability to
> distinguish will extend much farther, and in theory the composite color
> should be brown. But I doubt this will ever appear brown...
>
> On Mon, 22 Jan 2001, denis bider wrote:
>
> > Hello everyone,
> >
> > I'm not entirely sure whether this puzzle is on topic - it's probably more
> > so than the guns debate I triggered, but anyway - here it is:
> >
> > Suppose we have two canvases, each 100m x 100m in size. We also have two
> > LARGE buckets of paint; we shall call these color1 and color2.
> >
> > On the first canvas, we paint square tiles of alternating color, each square
> > being 0.25m x 0.25m in size. I.e., the first square has color1, the second
> > one has color2, then color1 again, and so on until we paint the whole
> > canvas. After we're done, the canvas should look like a chessboard:
> >
> > HOHOHOHOHO
> > OHOHOHOHOH
> > HOHOHOHOHO
> > OHOHOHOHOH
> >
> > On the second canvas, we paint a balanced mixture of color1 and color2:
> >
> > XXXXXXXXXX
> > XXXXXXXXXX
> > XXXXXXXXXX
> > XXXXXXXXXX
> >
> > Then we hang both canvases on something large and remove ourselves far
> > enough away not to see the individual square tiles on the first canvas. What
> > is the perceived color of the first canvas? What is the perceived color of
> > the second canvas? Are they the same?
> >
> > - denis
> >
> >

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