In addition to being represented by their own records, such so-called “attributes” can exhibit another characteristic property of entities (or relationships): they themselves might be the subject of some information (like intersection data). Thus, the intersection records required to list the children of employees might include their birthdays; the intersection records listing the colors of multi-colored cars might include the percentage of a car’s surface covered by a given color. To summarize, consider the contradictions in the following assertions:
You play the game. See how many contradictory combinations you can find.
Then decide which of those assertions you’re willing to give up in order to achieve consistency.