Number Line

If after the zero we write 1, 2, 3, 4, it is only logical to write the complete number line like this, right?


Now, I really don't know what bewilders me the most: the way in which this student draw the number the ifirst time, or the fact that the second time he did it, he wasn't disturbed by the fact that he had to completely ignore -5, -6 and -7 to make the new line.