At a neighbor's garage sale, you find an old-time stereogram showing a group of people standing at the center of the Eiffel Tower's base, and a zeppelin hovering in the background. How do the relative positions of the main objects change in the left-eye and right-eye pictures, respectively, to achieve the 3-D effect?

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The Answer of At a neighbor's garage sale, you find an old-time stereogram showing a group of people standing at the center of the Eiffel Tower's base, and a zeppelin hovering in the background. How do the relative positions of the main objects change in the left-eye and right-eye pictures, respectively, to achieve the 3-D effect?

At a Neighbor's Garage Sale, You Find an Old-Time Stereogram