Don, how cool is that? Wow! I have used mine to tell if a surface was dark or llight, but nothing to compare to what you did. In God We Trust, Carolyn ----- Original Message ----- From: <dacoleman@xxxxxxx> To: <optacon-l@xxxxxxxxxxxxx> Cc: "Don Coleman" <Dacoleman@xxxxxxx> Sent: Thursday, July 29, 2010 11:41 AM Subject: [optacon-l] [optacon-l]gee, Mister Science! Hi, all! When I read Peg's message, I remembered an experiment I once did with my optacon. I have kicking around here a couple of lenses from an old telescope. I took one of them and placed it in front of the optacon's camera with the instrument set on white-on-black so that it would register daylight as light on dark. Pointing the lense and camera around the room and with my finger on the array,I seemed to be able to identify a couple of chairs near me. Maybe I did no such thing but only imagined that the "images" i felt were the chairs I already knew were there. All the same, it was fun and I thought it was interesting at the time. I wondered what would happen if the experiment were toughened up--made more rigorous--with real focussing of the lense, etc. Could Peg's friend get a travel aid out of that? Far fetched? You bet. But that's what many people thought about the optacon itself at its beginnings. Yours sincerely, Don Coleman--Mister Science, the telescope man! to view the list archives, go to: www.freelists.org/archives/optacon-l To unsubscribe at any time, just send a message to: optacon-l-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the message subject. Tell your friends about the list. They can subscribe by sending a message to: optacon-l-request@xxxxxxxxxxxxx with the word "subscribe" (without the quotes) in the message subject. to view the list archives, go to: www.freelists.org/archives/optacon-l To unsubscribe at any time, just send a message to: optacon-l-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the message subject. Tell your friends about the list. They can subscribe by sending a message to: optacon-l-request@xxxxxxxxxxxxx with the word "subscribe" (without the quotes) in the message subject.