14 inches may not sound like alot to you,

but when we were keeping my male in a tall tank, he would roam around on a tree (exactly like you have in your pics) and try to climb around the top of the tank. BUT he did fall numerous times. He would propel himself till he was barely holding anything, and fall HARD. He has landed on his water dish, his tree, his hides.

I worried about him hurting himself because the *thunk* was so loud, that I decided to not risk any climbing accidents and put him in a tub. He has settled down and is completely fine.
I personally wasn't going to allow him the chance to get hurt by moving him to a shallow or low enclosure.

Balls may be better climbers when they are young, but with my past experience, I won't allow mine that opportunity to climb like I did before.