Another answer might be, well, it came from a sort of lone genius working in his garage, who, working away on different kinds of bikes, comes up with a bike out of thin air.
Jawaban lain mungkin, ide itu datang dr seorang jenius penyendiri yg biasa mengoprek digarasinya, mengerjakan berbagai jenis sepeda, dan akhirnya mendapatkan ide itu dr langit.