Weekend Lesson Planning

I'm teaching Colin to add, just the x+1 family of math problems. Colin works best with a number line, so I am looking for a very good, proffesional looking number line that a kindergartener would like to use. However, Colin is very particular. This number line is not good enough:

lifted from Elizabeth Richards

He likes the above image because it has animals, but the number line is not "real" because it doesn't have arrows.

So far nearly every time I've drawn a number line, I've included arrows on the ends symbolizing infinity in either direction. It's an old habit from high school and college algebra. Now Colin won't accept any number line without arrows.

Here's the one he liked best that I found online:

lifted from Smart Exchange

Seriously. The absence of numbers does not matter to Colin. As long as it has points and arrows on both ends, he is very happy.