The roof that became the origin of all roofs was perfect. It was tall and wide so it could fit and protect everyone. And the dimensions were perfect too.
This perfect roof was commissioned by Genghis Khan (かん). We got all of the carpenters and home makers and construction workers he'd conquered together and tasked them with making the first roof, but only if they made it absolutely perfect.
Currently there are no similar looking kanji which exist in the WaniKani learning system