On a dark gray blackboard, many mathematical formulas are written in chalkOn a dark gray blackboard, many mathematical formulas are written in chalk
The inscription on the blue board with the old chalkThe inscription on the blue board with the old chalk
A playing field with green grass and a drawing with chalkA playing field with green grass and a drawing with chalk
On the asphalt, figures are drawn in chalk, which are held by a guy and a girlOn the asphalt, figures are drawn in chalk, which are held by a guy and a girl