Lecture with formulas on the blackboard in front of studentsLecture with formulas on the blackboard in front of students
Smena-8 camera, lens mount, reflection on the tableSmena-8 camera, lens mount, reflection on the table
A tropical waterfall with a spray cloud on the background of the skyA tropical waterfall with a spray cloud on the background of the sky
Christmas tree in the snow in winter look like small housesChristmas tree in the snow in winter look like small houses