Prezi is a free, visual presentation tool. It has become very popular over the recent years, and many have already replaced their Powerpoints with Prezi-presentations, because the tool gives some new visual possibilities and is easy to use.
In the monologic form of teaching, Prezi can be used by the teacher tointroduce to a topic, and to present the main concepts of the subject to the class.
Within the polyphonic form of teaching you can let students collaborate on the development of a Prezi – for example, one can allow groups of students to work simultaneously with various parts of a Prezi presentation, and turn it into a kind of common 'mind-map’ on a specific topic. The tool can also be used for the students' presentations – It will be motivating for many students to be able to make a nice, visual presentation, and since the tool is intuitive and easy to use, the vast majority of learners will be able to use it after a short introduction.