Tap a nail into the vertical middle of the wall at one end of the corridor. Tie a piece of string to the nail.
Pull the string down the wall and make a loose spoon shape using a contour drawing method (all one line). Tap in additional nails at the beginning of the bowl of the spoon, and tape the string in place to get a rough idea of the spoon shape.
Adjust the size and shape of your string-spoon as necessary so that it fills the length of the corridor.
Remove the string, but leave the nails and tape in place. Measure the string to get the measurement of the rope light you will need.
Purchase the proper length of rope lighting in red or white.
With the end of the rope-light cord at the baseboard, attach the rope light to the wall using C-hooks or clear plastic hooks in place of the nails and tape markers.
Create the spoon shape on the wall with the rope light. Use any excess rope lighting to double-back over the spoon shape if necessary.
Use cord-hiding trim to camouflage the cord hanging down from the lighting.
Plug the lighting into the hallway outlet to complete the corridor artwork.