# Re: physics trick

From: John McCulloch (jmcculloch@mindspring.com)
Date: Mon Jan 22 2001 - 15:56:17 MST

The color on both canvases should be similar with the following difference:
When two colors are mixed mechanically (the pigments are mixed together
before applying), they lose some of their intensity. When two colors are
mixed optically (being placed side by side or in transparent layers on a
surface), they retain their intensity and they sometimes appear brighter.
The aspiring painter would be wise to note that when mixing two contrasting
pigments in equal proportions, one of them usually dominates in the
resulting color.

----- Original Message -----
From: "denis bider" <denis.bider@globera.com>
To: <extropians@extropy.org>
Sent: Monday, January 22, 2001 8:22 AM
Subject: physics trick

> 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
>
>

This archive was generated by hypermail 2b30 : Mon May 28 2001 - 09:56:22 MDT