Poor ninja...

Something I'm reading reminded me of nightingale floors. And free association led me to something Id read about flooring that generated power from footsteps and was bio-luminescent as well.

Which led to this image od a ninja confronted by a floor where the boards light up in different colors *and* played an associated note as you walked on them.

Talk about chalenging!

I bet everyone who used it would have an associated tune. Which would alert the guards as well as "announce" a visitor.