In this picture, we think of an "object" as
all its methods and data bundled together
into a single unit. This picture has the
advantage of being very simple, but it doesn't
help explain what the keyword "this" means.

  // Code
  Counter c1;
  Counter c2;
  Counter* c3 = new Counter;
  c1.clear();
  c2.clear();
  c3->clear();
  c2.increment();


// The code's picture.

                   stack                  |           heap
                                          |
    Counter object                        |
   +---------------------------+          |
c1 |                           |          |
   | void Counter::clear()     |          |
   | {                         |          |
   |   count = 0;              |          |
   | }                         |          |
   |                           |          |
   | void Counter::increment() |          |
   | {                         |          |
   |   count++;                |          |
   | }                         |          |
   |                           |          |
   | int Counter::get_value()  |          |
   | {                         |          |
   |   return count;           |          |
   | }                         |          |
   |                           |          |           Counter object
   | private int count         |          |          +---------------------------+
   |                           |          |          |                           |
   +---------------------------+          |          | void Counter::clear()     |
                                          |          | {                         |
                                          |          |   count = 0;              |
    Counter object                        |          | }                         |
   +---------------------------+          |    +---->|                           |
c2 |                           |          |    |     | void Counter::increment() |
   | void Counter::clear()     |          |    |     | {                         |
   | {                         |          |    |     |   count++;                |
   |   count = 0;              |          |    |     | }                         |
   | }                         |          |    |     |                           |
   |                           |          |    |     | int Counter::get_value()  |
   | void Counter::increment() |          |    |     | {                         |
   | {                         |          |    |     |   return count;           |
   |   count++;                |          |    |     | }                         |
   | }                         |          |    |     |                           |
   |                           |          |    |     | private int count         |
   | int Counter::get_value()  |          |    |     |                           |
   | {                         |          |    |     +---------------------------+
   |   return count;           |          |    |
   | }                         |          |    |
   |                           |          |    |
   | private int count         |          |    |
   |                           |          |    |
   +---------------------------+          |    |
                                          |    |
                                          |    |
    Counter pointer                       |    |
   +--------------+                       |    |
c3 |  ------------|-----------------------|----+
   +--------------+                       |