Hold a card, envelope or piece of paper on edge in front of your face so each eye sees only it's its corresponding image - left eye cannot see the right image and vice versa.

If you have trouble viewing these, move closer or farther away from your screen. There will be a point where the 3D locks in, outside of that you'll never see it.

The larger the image, the farther you will have to be to make it work. Think 'triangles' -- you are trying to align two virtual triangles, each eye being a vertex and the image being the opposing side.

I can make the larger versions work if I'm about 2 feet from the screen.

These images should be around 1800 pixels wide, so that they fill up more of the screen.

I can view the small & the larger image by holding a finger up in front of the images and focusing on it. Then the 3D image comes in to view and I can move my finger out of the frame and still see the image. Even move my eyes to scan around the image. The upper one looks great! I can also see the lower one but it looks much flatter.

DuluthGirl: Yes, either the top or bottom pair will look "backwards". Because the bottom two look right to you, you are a "blank stare" viewer (like I am). Others are "cross eye". You can search "stereo". I still have 20 ready to go on Shorpy, but I don't want to overdue it. I have close to 5,000 3-D slides.

Jenny: I do that also, with pictures next to each other. We are not crazy (although my wife may not agree).

drawsing: No one can do the enlarged image up close without a special viewer. My personal limit is a double image about 6" wide.

I love these 3D things so much, I find myself unfocusing my eyes at non-3D photos, hoping that by doing so I will somehow make them 3D and see them that way. Perhaps I should not be admitting all of this online. But in this one, the gorgeous everywhere-blue is surpassed only by the fact that when the 3D view pops in (takes about 0.1 seconds), I can practically feel the balmy breeze of that day and the brush of a palm frond on my cheek.

This is, as Dave says, definitely a 1955 Ford. The “V” door chrome on the 1956 cars extended below the bottom of the 1955 "V."

I stare at the bottom photo of the small version, relax my eyes and it clicks together into a 3d image. But I just can't do it on the big "clicked on" version. Can anybody do it on the big version?

I'll take both thank you!

In this beautiful Kodachrome! Unusual that this top of the line Ford Sunliner has the bottom of the line hub caps instead of full wheel covers.

[The "top of the line" Ford for 1955 was the Fairlane Crown Victoria coupe. Full wheel discs were optional at extra cost on all other models. - Dave]

I love these 3-D photos—please keep sharing them! (It would be nice if there was a tag to search.)

When viewing these 3-D (by cross-focusing my eyes), is it just me or does one or the other (top set or bottom set) always work better? In this case, the bushes and distant trees behind the young man in the top just won't resolve as well as the bottom pair, which come out perfectly. (Is that why each image comes with two options?)

To learn how you can view this stereo slide in 3-D, please see this post.

Golly, I had completely forgotten cabana sets (matching trunks and overshirts)!

They were my trademark outfit back then. I lived in a summer resort community and they were great: Slip on the shirt, button a button or two, and you were "decent" to go in a shop or restaurant.

I believe the Ford is a 1956. The side chrome piece with the big "V" on the door came out in the 1956 Victoria models. My family had a Fordor.

[Wrong! - Dave]