Quick Mathematical Card Trick

So you're only posting the magic trick but not the mathematical basis for it? What a parker square.

1:12 "Ace of spades, there you are, what are the chanc- well quite high, I guess about 2%" This is how mathematicians see the world

Nice deck swap with the chair adjusting, Matt.

0:25 You switched the deck when you scooted your chair and then very sneakily grabbed everything but what you needed for the aces by using (what i assume to be) your pinkie finger, allowing you to "shuffle" even after your switch, getting some people who made it that far. love you matt, 10/10.

you really parker squared that deck swap in the beginning there: wasnt subtle at all

It's a metal ball and the cavity is basicly an octahedron with each vertex pointing to a number on the outside.

So the deckswap was very obvious, but makes a good presentation to show the ace of spades. My suspicion for the spherical dice would be a 6-pointed shaped cavity, with the points pointing at the numbers, and a small weight free-floating inside the cavity. When you roll the dice, the weight eventually drops into one of the corners, pointing that number 'down', and since the shape is symmetric (because the numbers on the spherical dice are symmetricly printed, right?), the opposite (7-the number weighted) side is shown to be 'up'.

Inside of the spherical dice is an octahedron shaped cavity with a tiny metal ball inside of it that comes to rest in one of its vertices every time and these (six) vertices match up with the six numbers on the outside. You can easily show this works when you know how the platonic solids identify as pairs when you identify the middle of each face of one with the vertices of another; that way the dodecahedron and the icosahedron form a pair, the tetrahedron will be forever alone because it identifies with itself and - for this object to work most importantly - the cube and octahedron will identify. Actually this is described pretty well in Matt's book which was given to me as a present by my girlfriend <3 ;)

nice deckswitch at 0:25

Great deck swap and false shuffle. I really like that round dice.

deck swap when you adjust your chair

deck in hand under table when sliding chair - 29 sec

0:20 Next time make sure the bottom cards are the same! That would keep 'em guessing!

come on Matt....your explanations are thE best part...........& what this channel is all about

You sneaky guy, adjusting your chair after the shuffle huh! And '13'... so random :D

Keep your hands and the deck where we can see them! Well dodgy!

I knew he did a deck switch when he put the deck under the table after the shuffle

Clearly it's the power of The Heart of the Cards!

Or, jump in a car and ask your volunteer to give you a distance. Drive that distance, and then turn right. Repeat this 3 more times and you'll get right back to where you started. Magic.

Put your smart phone (or something else that reflects) on the table while you're doing the trick and you can "predict" the card... then it's a even more cool trick