Well, the entire project isn't invisible - however a very important part of it is! Created by Instructables user "musictechbolivoa", the harp strings' electronic equivalent is a row of infra-red transmitting and receiving LEDs monitored by an Arduino. To play the harp it's a simple matter of the user breaking the infra-red beams as if they were playing the strings, and the Arduino then sends the data back to a PC via a MIDI interface. Watch the following video for a good musical demonstration:
You have to hand it to the creator, they've certainly used some imagination and created a simple yet fun device. However you don't need to have a specific MIDI shield, there's links to software to allow connection via the Arduino's USB. For complete instructions, visit the project Instructable. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
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However we don't leave you alone to figure it all out, included is a great project and instruction booklet, plus access to a supporting web page and software examples. In other words - this is everything you need to get started for a fun range of electronics and Arduino related projects! So to get started or for more information and to order, check out the product page.