The so-called synesthesia refers to a psychological phenomenon in which one feeling causes another feeling to be strengthened by the simultaneous action of another feeling. According to the above definition, which of the following is not synesthesia among the following options? ['Someone gets excited when they see red.', 'In the hot sun, Xiao Liu will feel more comfortable wearing sunglasses.', "Xiao Zhang remembered last night's nightmare and still felt fear.", 'k clothing looks more convergent than light clothing.']