Newton could not shut the door since the cat would meow and scratch. His solution was to cut a small hole at the bottom of the door and place a piece of fabric to cover it. In this way, the cat could come and go at will. The cat flap has since evolved. We now have electronic chips sewn into animal collars that will only permit entrance to your pet.
The number of cards in a deck is based on the Gregorian calendar. There are 4 colors for the four seasons of the year, 12 figures for the 12 months, 52 cards for 52 weeks and the sum of all points in a deck of cards plus the joker is 365 representing the number of days per year.