If there is anyone out there who has not seen a calligram, I suggest they stop right now and put it into an internet image search! It is a beautiful combination art form.
I think it is so amazing how calligrams use two different art forms to create a new art form.
I think this style of art can help people learn what certain words are. It also helps you focus on the subject at hand.
For instance, sometimes a poem itself can seem to have multiple or confusing meanings. But if the poet puts their words in a picture, it helps more people understand, gauging a larger audience.
Also it can be an early education tool. You can use specific calligrams to describe what a word means. For example, the word grow as a calligram can be : grOW...This shows the actual word starting smaller and getting bigger. So you not only see the actual word, you also see the meaning of the word! These kind of calligrams are great learning tools!