Different lights do make me strange, thus into different sizes I will change.

Why this works

The answer to this riddle is "pupil," and it works because of the clever interplay between the meanings of the word and its physiological function. The "different lights" refer to varying levels of brightness; when exposed to bright light, the pupil constricts (becomes smaller), and in dim light, it dilates (becomes larger). This change in size gives the pupil a “strange” quality, as it adapts to its environment, making it a fun and intriguing answer!