As always, certain civilizations have certain decorations and markings that are often used within a time period by artists and this occurred during the ancient times as well. That is why it is often easy to guess where a certain vase or a picture come from, because they represent that civilization through specific markings.
This would be false. In a culture, many things are done similarly. This would include the past. If you've ever seen Egyptian artwork, you would see that many things are similar.
