Just like farm cat Marlene, Mowgli likes to place himself into a box, whenever one is available. I did a quick Internet research on the topic and learned that Wired, no less, has written an article on this phenomenon in their science section in 2015. They also shared a link to a hilarious video on cats and boxes, which is a great pick-me-up after a long, stressful day.
The flowers, that Mowgli placed himself in front of so decoratively, are a white-purple pansy, yellow ranunculus, red daisy, thyme (technically not flower but a herb) and blue forget-me-nots. I bought them to make a tiny indoor garden as an flower arrangement on the dining table, when I was expecting guests.