Nylon 56cm Parasols.
56 or 60cm is the diameter when opened right pout. Perhaps they can be called 28cm as regards the radius? Small, maybe flower girl sized parasols. Most are plain single simple colours.
22 divided by seven colours of the rainbow times the radius squared gives wisdom or the area of the umbrella if my memory is correct. Get your centering looking at other's centred thoughts to our boundary of what IS, and get knowledge that has passed.
These are more for children or suchlike child like thoughts.
A bit small for adults if in the mainstream angled square domain.