Some teams may design systems that do not involve pulleys. These are valid inventions and provide an opportunity to compare different designs and discuss the advantages and disadvantages of a pulley. There are dozens of applications that resemble a pulley system. From the program, the students will remember that sails are rigged in a similar fashion. Also, some students may be familiar with clotheslines that operate on a similar principle, with a single loop of rope running continually around the system.
Ski lifts use the same model, as do flagpoles in a vertical manner.