Now the magic. Pour some of the white mixture onto your base, more or less the amount to make it touch the edges of the cake form. Then pour some of the black mixture right in the middle of the white mixture, and let gravity do its work so that it floats a little towards the sides. Then pour some of the white mixture right in the middle, then black, until everything's finished or the spring form is full. I had enough to make two extra little cakes. Your cake is now ready. Put it in the fridge.