it was seemingly everywhere, the car, the kitchen counter, the knapsack. having the right tools at your disposal can simply make it easier to balance one-to-many and one-to-one instruction and correction — and striking that perfect balance is what makes for a successful “guide on the side” during student-led learning. i have created a closed surface model (think closed box). then the cylinder was removed and the ribbon was sent to a person who had an identical cylinder. was your purchase in a large city? 