Blackout Poetry is a mixture of poetry and art made by taking any form of printed text and blacking out the unwanted words to create a poem or statement.
Standard techniques usually involve a black sharpie marker, but have evolved into other traditional (and even untraditional) types of art mediums.
I find it to be a look into the subconscious mind, a form of therapy if you will, that can promote mindfulness and creativity that can help overall well-being and mental health.