“…Some authors have also identified developmental trends in students' spatial reasoning abilities across age (Bornstein and Stiles-Davis, 1984;Schuler, 2001). Students' ability to recognize reflective symmetry has also been investigated in older children (ages 8-16) (Ku ¨chemann, 1980;Meyer et al, 1992;Hoyles and Healy, 1997;Falba and Williams, 1998;Seidel, 1998;Ramful et al, 2015;Dejarnette et al, 2016). Evidence suggests that children of all ages discern vertical reflection symmetry in objects (meaning reflecting something across a vertical line) more easily than horizontal symmetry (Fisher and Fracasso, 1987) and diagonal symmetry remains difficult even for older children (Ku ¨chemann, 1980;Bornstein and Stiles-Davis, 1984;Seidel, 1998;Ramful et al, 2015).…”