On a dark gray blackboard, many mathematical formulas are written in chalkOn a dark gray blackboard, many mathematical formulas are written in chalk
A green sprout makes its way through a crack in the boardsA green sprout makes its way through a crack in the boards
Aircraft carrier with airplanes and turntables on boardAircraft carrier with airplanes and turntables on board
Minimalistic new year's composition on the background of the boardMinimalistic New Year's composition on the background of the board