In my school days long ago, we made a herbarium in biology class more than once. Plants were collected, placed between blotting paper, pressed with the help of thick books and then stuck onto white cardboard with adhesive tape and labelled. The result was quite respectable and had a touch of science.
This is now a spontaneous experiment I made with my smartphone during walks in the Corona summer of 2021 and posted on social media. I do not guarantee the correctness of the plant identification. I have done my best.