Lecture with formulas on the blackboard in front of studentsLecture with formulas on the blackboard in front of students
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
A field of pink cosmos on the background of mountains and cloudsA field of pink cosmos on the background of mountains and clouds
The road among the fields on the background of sunsetThe road among the fields on the background of sunset
The rays of the sun fall on the leaves of the treesThe rays of the sun fall on the leaves of the trees
Sunset in the clouds and the forest quietly falls asleepSunset in the clouds and the forest quietly falls asleep