Wow! Definitely different from any other bluetooth-usb-dongle-thingie picture I have ever seen! :-) Thanks for posting the set-up shot. Without that I would also have thought there was water involved, somehow. Nicely done.
I'll give a hint..... NO water was used in the production of this image.... aside from a little perspiration perhaps... :-)
Just... a camera, a piece of nichrome wire and a little dab of blue tack, a piece of white poly-foam packing and natural sunlight streaming through a window!...
Oh yes, ... and the little blue tooth usb dongle thingie!