Drawing on sociocultural theorizing, this case study investigates and unpacks the qualities of "scientific play" during children's inquiry-based science activities framed by imagination and play (i.e. Poetry Science). The data were gathered in Finnish preschool groups with children aged five to six years old (N: 31) over a five-week period. The data consist of video recordings, observational field notes, and artifacts, subjected to multimodal analysis. The results show that scientific play that manifested throughout young children's inquiry process has the following four characteristics: (i) creating and maintaining an imaginary science situation, (ii) assigning new meanings to science objects and processes, (iii) combining imaginary situations and problem solving, and (iv) engaging in science talk in an imaginary situation. The study shows how imagination and play are important elements of children's science inquiry, with implications for early science education.