The "Kinderdijk" windmill image has the horizon-line running through a horizontal line-of-thirds and the main subject within the image, the windmill, is positioned along a vertical.

Linda, the bride, is sat at an intersection of two lines corresponding to the "rule of thirds".

The "Market Garden" re-enactment pair are each at an intersection of lines and the horizon runs exactly along one of the horizontals, thus giving this image balance, harmony and a pleasing "feel".

The rule of thirds, or the golden section, gives images something that viewers experience as pleasant, calming, harmonious, "right".

It should not however be used as a hard & fast rule in each and every shot, rules were made to be broken and a totally out of balance, unharmonious, image can work very well precisely because of its tension, its "incorrectness".