Striking features are the simplest and most obvious classifications of information provided by material objects. The classifications include: colour, shape, size, number of items (up to four), and linear information.
Most of the concrete information that arouses the attention of human beings is visual. The ACL 4 cues can be seen by most people with a visual impairment who have lost their glasses. When they say they cannot see an error because they do not have their glasses, it is often a habitual excuse. But not always, which can drive you crazy.