Where you least expect it?

While watering and working on my office plants the other day, I found these six very tiny snail shells. They are each about 1/8" across! How amazing is it that these little beings lived out their entire existence on the window sill in my office? Are their descendants still working their way slowly through the mini jungle that thrives in the morning sunlight? I'll have to find the time to look carefully..... how cool if I could find some live ones!