A video recently went viral on social networks, surprising many users, but apparently also making some people doubt whether it was real. In the video, a row of bricks can be seen tipping over like dominoes. So far it's completely normal, but then the domino effect is reversed: the stones that have fallen on top of each other fall over a little bit from back to front so that they lie perfectly next to each other.

For example, the video can be seen here:

The brick double domino effect

The above video is not the first of its kind and will certainly not be the last, because this effect, which is also known as the brick-double-domino effect, is always a guarantee for impressive videos and a corresponding number of likes - even if it is doesn't always work so smoothly:

You can even calculate the speed of the wave at which the stones fall using a… er… “simple” formula that the Instituut–Lorentz in the Netherlands published HERE

v = sqrt(3 g h/(1 + h^2/b^2))* (s+b)/h

In the formula, g stands for gravity, h for height, b for width (base) and s for distance.
However, this does not answer the question of why they fall over “double”, so here is an illustration of how you can reconstruct the double domino effect yourself using bricks.

First the stones are placed directly next to each other:

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The stones are next to each other, source: YouTube

Then you stand them upright:

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The stones are placed vertically, source: YouTube

Since the stones cannot fall over completely (they were previously exactly next to each other), they remain a few millimeters on the front stone:

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The stones cannot fall over completely, source: YouTube

However, the last stone can fall over completely, meaning that the previous stone and all other stones now have space to fall back into their original, horizontal position:

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Now all stones can fall into their original position, source: YouTube

Here you can see a video explaining this in English, including a nice mathematical formula:

So there is no magic behind it, no video manipulation, but a logical effect.


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Notes:
1) This content reflects the current state of affairs at the time of publication. The reproduction of individual images, screenshots, embeds or video sequences serves to discuss the topic. 2) Individual contributions were created through the use of machine assistance and were carefully checked by the Mimikama editorial team before publication. ( Reason )