Being able to choose your own shape is a great feature of Tagxedo. It’s an example of technology that is not the focus of a task but a tool that allows students to add a creative and personal touch. I would use it at the beginning of a science topic by asking the students to brainstorm their prior knowledge of relevant words.
So, rather than just writing words in their exercise book I am using technology to make the task more personal and creative for my students. In this example the pedagogy rather than technology comes first. Just click on the Tagxedo if you would like to take a closer look.