Nigerian naira
On the 1000 naira notes, there is a subtle shiny strip running down the back of the note.  It is a shimmery gold colour showing 1000 naira.  The triangular shape in the middle of the front of the note changes its colour from green to blue when tilted.  The main feature on the front is the engraved portraits of Alhaji Aliyu Mai-Bornu and Dr Clement Isong, former governors of the Central Bank of Nigeria.