This paper reflects on a project-based curriculum employing constructed languages to teach linguistics, with a focus on phonology. In a special topics linguistics course, nine students were led through the construction of a language. While students in introductory linguistics courses sometimes struggle with phonology, active engagement with a semester-long language construction project endowed these students with the practical motivation to understand (1) what phonology is, (2) how phonological rules work, and (3) why rules surface in the first place. They readily captured generalizations based on natural classes of sounds, recognizing the systematicity of their constructed phonology. Student performance and engagement in this course support the use of constructed languages as a pedagogical tool in linguistics. Because an ongoing project builds in problem-solving opportunities and processual thinking, highlighting relationships among key concepts, students achieve a more comprehensive understanding of core areas in the broader linguistic picture.