when a small object is held between the first and second fingers crossed in such a way that it touches or presses upon skin surfaces which ordinarily are not pressed upon simultaneously by a single object, it is perceived falsely as two.
Health4All
when a small object is held between the first and second fingers crossed in such a way that it touches or presses upon skin surfaces which ordinarily are not pressed upon simultaneously by a single object, it is perceived falsely as two.