My high school physics teacher is such a great teacher and an even greater person. All of his students absolutely love him and he loves teaching us. In a few weeks, it will be time to become seniors, and sadly, we'll have to plan days where we can only visit our old teachers just to say hello. I was thinking of some ways to show our appreciation for him. Perhaps myself and some of my friends would like to buy him something. I know it is materialistic to buy something to show our gratitude, and that it should be shown through words, but I think this guy merits a real gift. Can anyone toss up some suggestions in the air as to what 2-3 people could buy that shows true appreciation? Thanks in advance!