Lecture with formulas on the blackboard in front of studentsLecture with formulas on the blackboard in front of students
A fiery retro car with a trail of fire on the background of a red-black skyA fiery retro car with a trail of fire on the background of a red-black sky
A gray block of rock on the shore, against the background of a lilac skyA gray block of rock on the shore, against the background of a lilac sky
Summer field with flowers on the background of forests, mountains and cloudsSummer field with flowers on the background of forests, mountains and clouds