It is also unclear which school of kung fu it originates from. Again, orthodox opinion holds that it comes from the Crane or Tiger schools but there is a suggestion it may be from the Dragon school. The form does resemble to an extent Nipaipo, as created by Shito ryu founder Kenwa Mabuni, and which itself was influenced by Neipai, a White Crane form taught by the famous Gokenki.
The kata builds on the concept of multi-directional fighting introduced in Shisochin and Sanseru while introducing new techniques such as the hiraken (one knuckle fist - an excellent means to attack vital points or otherwise make pinpoint attacks).
Master Morio Higaonna performing Sepai