The simple way to remember the Bell-LaPadula model is: No read up, no write down.
A classification is the label and controls whether the subject (person) can read the object (document, file, etc). For this example, I will ignore compartments.
Let's create four people Alice, Bob, Charlie, Diana, and Eve. Now let's give each one a label: Alice is Confidential, Bob is Restricted, Charlie is Confidential, Diana is Secret, Eve is Top Secret. Each person creates a document, and when they create a document the document gets the same label as the person who created it. Alice creates Document A, Bob creates Document B, Charlie creates Document C, Diana creates Document D, and Eve creates Document E.
You can now create a simple table showing what happens when someone tries to read a document.
For reading:
| Doc A | Doc B | Doc C | Doc D | Doc E |
-------------------------------------------------
Alice | allow | deny | deny | deny | deny |
Bob | allow | allow | deny | deny | deny |
Charlie | allow | allow | allow | deny | deny |
Diana | allow | allow | allow | allow | deny |
Eve | allow | allow | allow | allow | allow |
