Absence is Yoon's reaction to the events of September 11, 2001, when two jets collided with the twin towers of New York's World Trade Center. The 121 page book has no markings or printing of any sort; instead it is illustrated with the cut aways from each page. The cutaways resemble a tiny round hole for the first nine pages before expanding to two adjacent squares, representing the foot print of the WTC. The last page shows the surrounding buildings. Yoon has created a book that is about what is no longer in the world, just as she has excised the material from within the book.
