What you want to do is make two bricks. The first one will be the first brick position. Turn rendering on on that one. The second one, turn off. Name the two bricks whatever you like. Make your trigger thing (Like onplayertouch>our stuff) When you activate or step on or whatever, have it simultaneously turn the rendering off for the first brick and on for the second. It's a very tedious process to make it look like a brick is moving down a conveyor belt, and this is usually only used for like cabinet doors.