Curious as to why conducting gesture are both acknowledged and ignored by choral singers, this article investigates the enigmatic nature of the act of conducting. Education and research are biased toward gestural aspects of the choral conductor role. At the same time, research shows that gestural skills rank strikingly low compared with other…

This case study explores how 12-13-year-old students encounter proportional reasoning while working with geometric patterning tasks using concrete materials. The focus is on the students' use of spontaneous concepts when first dealing with such patterns in the context of collaborative work. Based on video recordings of a single lesson, a…