yeah our little girl is like that too. She can see them a mile away and just starts freaking out about them. Our son was like that with clocks when he was ~2yrs old too... now idea why. They funny thing there is that he couldn't pronounce the "L" so he just started yelling "c-ock! c-ock!" and pointing. Good times in grocery stores and such.
Edit: Oh I forgot... when the Jr. Foreman saw his cake this morning, he explained that we had it wrong and the Front End loader should be lifting the rocks and the dump truck dumping dirt into the hole. We made the adjustments. Silly us.