The initial gunpowder is placed in a paper tube deliberately left unbalanced, meaning that when it explodes, the pieces ignite in a topsy-turvy, unpredictable fashion.
煙火彈在空中燃燒的時間，也必須拿捏得準，以決定何時該發射下一批彈。快了，兩批彈在空中互相「廝殺」，結果是「兩敗俱傷」，觀眾只看到一團色光，毫無景緻可言；太慢了，又讓人覺得節目內容鬆散，枯燥無趣。