Mystery Spot

When I arrived at school today, I noticed more cars in the parking lot than there have been. I wondered about this, but decided they must belong to the crew installing the new computers and maybe some teachers. I had yet to tour the building, so my 4 children and I went exploring. My husband called as I was walking down one hall, and we were having quite the conversation about bookcases and the day's schedule. When I passed one of the classrooms, I looked up and found an entire room full of grownups (including my principal) staring at me and probably wondering who was this loud woman roaming the halls. (I think my principal probably knew it was me, which makes it all the more embarrassing!) Anyway, I am really overwhelmed by trying to arrange my classroom. For now, I've tried creating large group and centers. I measured everything and am mapping it out at home. I unrolled my second rug to find a large brown spot near the middle. I'm afraid to know what it might be, but naturally my children walked and rolled through it in their playtime today despite my somewhat hysterical warnings about its probable origin. I guess it's old enough to not be dangerous, but I'm putting rug cleaner on the shopping list.