Aiden is up to four or five steps at a time unassisted, and is VERY PROUD of himself when he does it.
He is also throwing tantrums at the least provocation. Fortunately he is relatively easily distracted from them.
I'm starting to try to teach him "no" when he grabs my glasses, and that when he deliberately throws something on the ground I won't get it for him right away. Interestingly, when he has an object that he's about to drop and I say "don't drop it!" he doesn't. At least not right then.
He's also starting to comprehend the shape sorting toy. He's been fascinated by circles for the last couple of weeks, nesting them inside each other, holding them together, flipping them over, etc. It's so fascinating to watch him figure things out!
Also, as lordandrei has noted, he's been taking things out of boxes, putting them back in, and then searching for the same object to pull out again.
And then there's the pelvic thrusting. Little one, you're too young for Rocky Horror!