In the end, they could feed a black-and- white image of a marked-up face into the computer, and out would pop an automatically rotated portrait that was creepy, pointillistic, and remarkably accurate.上句，pop out 是“突然出现”，是不及物的短语动词。倒装句还可以是：out popped + 主语。因主语 portrait 太长而倒装。第二个句子，语序正常，第二并列分句承前省略了 it is，没有可疑之处。It is an astonishing crude and simple-minded way of thinking and for that very reason （it is）increasingly popular.