Practical Examples
Identical twins don’t always like the same things. Twin1 may love soccer and hate golf, twin2 may love golf, enjoy soccer and hate football.
If you make pictures from the same carved wood block stamp, no two will be exactly alike. There will be variations in the design due to the ink coverage, the pressure used, and several other reasons.
If you use a microscope to look at two separate 20#, 8 ½ x 11 sheets of blank paper, you would see a different pattern in the wood fibers and how they line up. They can not be exactly alike.