Skip to Content

Mystery Cache

3D -Stereo- Vision Rocks!

A cache by Iowa Tom Send Message to Owner Message this owner
Hidden : 12/17/2006
In Iowa, United States
3 out of 5
1.5 out of 5

Size: Size: regular (regular)

Join now to view geocache location details. It's free!


How Geocaching Works

Please note Use of services is subject to the terms and conditions in our disclaimer.

Geocache Description:

A cache designed to introduce people to stereo viewing and stereo photography.


Flood water level check.

The coordinates for this cache are “hidden” in the stereo graphic image to the left. In order to pick out the last three digits of the latitude and the longitude you will need to look at the graphic using the technique called cross-eyed stereo vision. When stereofused the last three digits of the latitude will appear, maybe 1/4 inch, closer to your eyes than the plane of the screen. The last three digits of the longitude will look a bit farther away than the plane of the screen. To determine the correct order of the numbers that appear above and below the screen, arrange them in the order that they appear when scanning from the top of the graphic to the bottom of it. Higher up on the list = sooner in the order.

To see the 3D effect, start by aligning the left and right black dots until you see three of them. The center one is two that are fused. Force them into focus. If it is not, then try, try and try again. Possible headaches aside, the more you try the better you will get at it! Don’t worry; your eyes will not stick in the cross-eyed position! When properly aligned you should see three boxes. Pay attention to the flashy middle one. Many colors will appear ghost-like, coming and going. That in fact will make the job of stereo fusing the two blocks more of a challenge, hence the rating of difficulty on this cache. [NOTE: it’s always easier to do this when the graphic is small. It may be easier to copy the graphic to a Word document then adjust it to shades of gray.]

I’m sure there are ways to get around the stereo viewing technique. Since the reason for this cache is to teach people how to stereofuse two images to see in 3D w/o having to use special glasses, I do not think anyone should claim this as a find unless they get the coordinates in the way I intended them to be obtained. If you do succeed tell us about the experience when you post your log.

Shown to the right here is one of the many cross-eyed viewing 3D images I’ve taken. Click on it. I greatly exaggerated the depth. If you like what you see and are a premium member, take a look at this “off-topic” thread I started.

In the cache you may find anaglyph glasses. Take one per family please. They are red/cyan. If you trade for a pair, make sure to go to this website! Try Googling anything with the word anaglyph and see what you can find. After viewing for a few minutes take the glasses off and look around the room first with your left eye then with your right eye only. Another neat thing to do is when looking at a crater on Mars, reverse the colors for each eye. Stare at it for a few seconds and it should turn into a bump!

Here is one of my favorite anaglyph images of Mars.

Good luck! Click on the Earth for a coord verification.

. .

Additional Hints (Decrypt)

Gjrrg, gjrrg.

Decryption Key


(letter above equals below, and vice versa)



  • 3D Earth This was made by using two screen captures of the rotating earth projected in the NASA World Wind Program. See:
  • A cross-eyed 3D image from the arch Cross your eyes and see wonderful 3D in this image! The original size is a lot sharper.
  • A view from my Chimney Swift cacheSet up for cross-eyed viewing.
  • Asters in 3DThese beautiful asters were growing near my garage. The camera was moved about 10 cm between the shots.
  • Clementine Satellite images in 3DThis was made via two screen captures using NASA's "World Wind" Moon software.
  • Latest 3D graphic for coodsCross-eyed stereo viewing reveals the six missing numbers, three a little above and three a little below the screen. Above = lat and below = long, both reading from left to right. Cross your eyes enough to bring the two black dots together, hold them there, force your eyes to focus on them then look up at the black area for the numbers that appear above and below the screen. Good luck!
  • Mars in 3D!
  • More 3D from the St. Louis ArchThe original size is a lot sharper.

56 Logged Visits

Found it 43     Didn't find it 1     Write note 5     Temporarily Disable Listing 2     Enable Listing 2     Publish Listing 1     Needs Maintenance 1     Owner Maintenance 1     

View Logbook | View the Image Gallery of 14 images

**Warning! Spoilers may be included in the descriptions or links.

Current Time:
Last Updated: on 1/25/2017 3:53:49 PM (UTC-08:00) Pacific Time (US & Canada) (11:53 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum

Return to the Top of the Page