The problem is that your mind has been your master your whole life and won't easily relinquish its position. To trick you back into obedient slavery, your mind will divert your attention, often by giving you a tantalizingly interesting distraction. They sell the candy I love at the 7-11 up the road. I can get into my car and drive there and get that candy. What you are supposed to do is to witness your being distracted and return to concentrating on the object of your meditation.
Concentration is well worth persevering in and ultimately liberating, spectacular and a blessing.
The third illustration depicts Meditation. Here we have unbroken attention. The classic description of the difference between Concentration and Meditation is given in the example of pouring oil from a bottle into a bowl. At first the oil drips out a drop at a time. This is concentration.