Although your Matrix Design illuminate art piece has a very low power consumption, you will still need a mains supply to it.
Wiring concealed within the wall is best, as it will leave your feature light without any distractions to the eye. You may need to consult your electrician in order to achieve this. The electrician will run a lighting cable from the nearest switching point within the wall, to hide the power to the light fitting.
The other means to power up your feature light is to have a cord running to the nearest power outlet.