OT Visual trick

[harry]

Can you see how this is done?

[Brian Gaff]

No.

Brian

[Phil]

[Tim Lamb]

In message , harry writes

No.

Interesting that the frame is off camera so could be changed.

[Reentrant]

There is a very narrowl gap between two pieces in one arrangement that adds up to one square. Google for "miissing square puzzle".

[Broadback]

Also the bottom is not clear, there could be half size tiles there that loo like full size. However it is done it is clever.

[Jon Fairbairn]

I suspect it works the same way at this:

[Toby]

both times when he takes it out of the box, he flips over the bottom two pieces (nearest the camera) - when he takes it out of the box, which makes the squares go strange in the middle when it is on the table. when there are pieces out of the box, there seems to be more slop too.

[John Williamson]

Is the right answer. There is at least one explanation of this on Youbend.

The split squares in the centre are the key, and as has been said, when he reassembles the smaller rectangle in the frame, there is a gap at the far end, which has an area equal to the area of the three extracted squares.

[GB]

Precisely. Once he takes out a square, there's a clear crack in the centre of the puzzle. It looks quite small, but I'm sure it adds up to a whole square, and so on .....

[John Rumm]

Yup. I have a feeling we have discussed this here before - except the version with the triangle made from squares. It all comes down to slight errors in the accuracy of the diagonals causing fractional square changes across several that add up to whole squares elsewhere.

[The Medway Handyman]

I've always liked this one;

[Dave W]

No, this one is just video trickery. If you examine the 30-frame animated gif you will see that the sections that are removed from the bottom section gradually get bigger while moving to their final positions, so that the one separate portion has nowhere to go.

[dennis]

You can see the slight dislocation of some of the rows if you look carefully.

[Dave W]

Me too. There are two bloody great cuts in the video at 30sec and

2min20 during which three extra pieces have been added and subtracted on the tray while the main pieces are being taken out of the tray. In each case the pieces arranged on the table and squared up do not match at all while the extra pieces are in there the first time, or not in there the second time.

[Dave W]

Wow - it fooled me completely, but I won't give the game away.

[Chris J Dixon]

;-)

Chris

[Jon Fairbairn]

Ah, right.

[Bert Coules]

Me too. But my favourite thing about it is the wonderful, deadpan, completely unexplained, presence of the gorilla.

Haven't seen you much in the Asylum much of late, Dave. Mind you, haven't seen much of anybody.

[Huge]

Probably for another one of these "attention grabbing" videos. There's one where you're to count the number of times some basketball players bounce the ball, and a gorilla wanders on and off the court. 50% of viewers never see it.