…they keep flitting all over
The Doclopedia #3,070
A Bag Of Many Things:A Marble
This marble is a larger than normal one. When placed on the ground, it will begin to very slowly roll away from you. After about 5 minutes, it will be up to 20 miles per hour. After another 5 minutes, it’s doing 80 and you’ll never catch it.
The Dociverse Blog 