2. The fact that your children's skin is covered in pictures drawn by sharpie markers no longer alarms you.
3. You know that blocks are more than square things you stack on top of each other.
4. You learn to recognize your children at a distance by bodyshape, goggle straps, and back graffitti (random sharpie drawings, precisely drawn while bored at a meet)
5. You think nothing's weird about your daughter saying that when she was on the block the timers were reading her back graffitti, asking what a muggle was.
6. The smell of mildew-ed towels is common place.
7. Your kids abs feel like a brick (and you wish yours did).