Climbing

I've got a climber on my hands! Alethia climbs on everything...and out of everything. We have to strap her into her highchair now because she has started to turn herself around and stand up. She thinks its funny.
I don't understand how she is brave enough to do some of these stunts, but is too afraid to take a step on her own (with out holding onto something) it doesn't make sense to me.
Here are some pictures I took a few weeks ago, when she first started climbing. She climbed into the bath tub and back out again.