Separately, we enjoy looking at tattoos and optical illusions, so this union is the best of both worlds. Paul O'Rourke of Allstar Ink in Limerick, Ireland created this clever tattoo that will definitely make you do a double take. The swirling column that's inked on his client's arm appears to dip into two deep crevasses of the skin. From first glance, it seems like you could grab onto the “handle” of this person's lower bicep.
The impressive inking combines bold and graphic lines with small-yet-crucial areas of shading. Because most of the tattoo is so flat-looking, these specially-contoured parts are enough to convince us that this fellow has an unusually-shaped arm; we are mistaken thanks to O'Rourke's handiwork!