What is antimatter? (continued)
Paul was wondering how this could possibly be when a strange idea came to him...
Think about playing with "playdough" (Paul probably did). Starting with a flattened layer of dough, take a star shaped cutter and press it through the dough, now carefully remove the shape and .. hey presto, you've got a star! But take a look at the dough: there is another star there, exactly the same as the one you are holding - except that it's a hole, the "negative image", or opposite of your star. And you have no choice: whatever shape you cut from the dough, you also make its exact "negative" image.
Paul thought that particles must also be cut out of some kind of DOUGH, and then you would also have their "negatives" - the antiparticles!
