Love these little guys!

What I think would satisfy them for awhile is not necessarily the size of the space but to change it up, like move the contents around and change the angles of approach and dismount, so their routine of moving within the space is different and they have new challenges. Thus: "Oh wow, this stick is steep now! Maybe I need to fly up there, it's more than I can jump....Look at the view! Hey what is that? A new perch? Okay, lets see....Oh.....Yeah! Now I can jump on Lulu from here! Weeeeeee!"