"As ikebana has many different schools of thought, philosophies, and styles with their respective rules for proper ratios and approaches, consider finding an ikebana class or reading a book on ikebana if you are interested in pursuing this further. Serious devotees spend years, if not decades, practicing and perfecting this classical Japanese art form. So in other words, it definitely requires more effort and intent than cramming a bunch of Gerbera daisies into your grandmother's vase" From this website..
According to this site, the seven principles if Ikebana are:
3. Shape and line
Find information about the various schools of Ikebana here.
There are over 3000 schools of Ikebana so if you try, you're bound to get it right in at least one of them. In one school the longest branch represents heaven, the medium, man and the shortest, earth.
These arrangements are admirable but, being a vase crammer myself, I don't know if I could pull off such elegant minimalism.
My pal Alison (Bonney Lassie) remarked that this one using Fatsia leaves reminded her of our mutual friend Loree of Danger Garden.
May your weekend be filled with beauty, serenity, and balance.