Yank Hoe's "Sympathetic Coins" trick, as described by Downs, has always been to me a penetration effect. You spread a handkerchief out, put four coins on the corners, cover up two of them (eventually, after shifting the cards around a bit) and then pick up a coin, make it penetrate up through the cloth, and it ends up under one of the cards. All the coins end up in one corner, under one of the cards, but this is because they supposedly went up through the cloth. There is a lot of handling of the covers and the coins during the trick.
Al Schneider's original "Matrix" is a significantly different effect: Four coins are placed in a square. Each coin is covered up with a playing card. You gesture, pick up two of the cards, and one of the coins has moved from under one card to another. Repeat twice more so all the coins gather in one corner, under one card.
The key difference in Matrix is that after the coins are set down on the table, they are not touched. They are covered up by the cards, and then you uncover them and they have moved.
I haven't liked most of the variations of this effect that have been published over the years, mostly because they lose sight of what made the original so powerful: You apparently do nothing. You cover up the coins, gesture, and then uncover them and they've moved. You don't pick up the coins, flip them in the air, do some funny move where you slide the coin off the card and into your left hand, fan your left fist with the card, and then show the coin gone.
Matrix, like ThreeFly, Ace assemblies, or Twisting the Aces, is one of those very simple, direct effects that spawned lots of variations which clutter up the premise. It's simple and magical, and somehow it invites the kind of flashy tinkering that clutters the pages of many closeup books.