Making a de-chairification is easy. You need mediocre skills in gimp to make one. Here is compilation of two famous painting, in which the chair has an important role. Notice how the pope is show to not have any balance in the painting by Velázquez after the chair is removed. Suddenly the act of removing a chair reveals something about the person portrayed in the painting.
If you have some important representations you’d like to de-chairify please lets us know and we’ll do the work for you. Better yet! Make edit yourself.