Having discovered PO while reading Edward de Bono’s Lateral thinking, I have also found out that PO in Hawaiian mythology is the feminine force in the universe, linked to earth, darkness and night. Her male counterpart being Ao. PO is also one of the Teletubbies.
Going back to thinking laterally; PO is to be used a prefix to a statement which is supposed to provoke forward action.
Logical thinking being a selective process which includes the management of NO. Lateral thinking is the process of management of PO.