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
The nature of the mountain is a reflection of the blue sky in the waterThe nature of the mountain is a reflection of the blue sky in the water
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