[Blindmath] A 3d to 2d description resource?

[Michael Whapples]

Hello,
As well as what Richard describes for why it may not appear as a rectangle, 
probably the most likely cause, there may be additional things giving a 
slightly different image. If you are using a glass, then the surface is 
highly reflective and if light is coming from one direction or even from 
multiple directions you may find a few particularly bright spots where the 
light source is reflected but these reflections may not be the whole shape 
of the glass. Another thing which may give extra information might be any 
pattern on the glass, it can affect the reflections you get or if light 
passes through the glass then you may also get brighter and dimmer parts of 
the glass. To describe how this appears visually is quite hard to explain, 
although the physics of it (refraction and reflection) are fairly simple.

Michael Whapples

-----Original Message----- 
From: Pranav Lal
Sent: Wednesday, February 08, 2012 5:21 PM
To: 'Blind Math list for those interested in mathematics'
Subject: Re: [Blindmath] A 3d to 2d description resource?

Hi Michael,
<snip Are you sure you have never encountered a picture of a tree in a 2D
representation? The VOICE uses a 2D representation from what I know (stereo
headphones, left and right, vertical position pitch in sound). So you tell
us what a tree is like in 2D compared to the act of feeling it.
PL] I was thinking more about this question. Let us consider a glass on a
table.  When using the vOICe, I can see the full glass. However, when that
same glass is drawn on paper, I will only see a rectangle. How does this
happen?

I now understand how that glass becomes a rectangle when drawn on paper but
I am trying to distinguish between this and what I see with the vOICe.

I hope I am making sense.
Pranav


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