It's very funny to me that the stereotypical gelatinous cube is bright fucking green when the monster itself is almost perfectly transparent. Like its gimmick is that it's a monster that imitates an empty 10x10 hallway. How many people have fallen victim to gelatinous cubes because they "know" that the ooze is bright green and so don't bother to check the suspiciously clean corridor in front of them.