Riddle of the day

Answer to the last riddle.

The farmer takes the hen across first, and leaves her on the other bank. Next,
he comes back, loads the fox onto his boat, and takes him back across the river. He drops off the fox on the opposite bank, picks up the hen, and brings her back to the original bank. He swaps the hen for the corn, and returns to the far bank with the corn - leaving it with the fox. Then, he returns once more to the original bank to get the hen. Once he brings her across, all four are happy to be on the other side!

Today's Riddle:

You are in a place called Jack's World and there is only one law. There is a mirror, but no reflection. There is pizza with cheese, but not sausage. There is pepper, but no salt. There is a door, yet no entrance or exit. What is the law?

This one is hard ooo...ahnahn!!!