Simplicity
 She's a bit shy & likes to stand alone

"Building the theremin for my mentor was like working for my boss. He asks you to come up with some original CPI project that you would like to do, then you spend all of your time guessing at what "he" wants you to do. Good ideas take time to develop, communicating them is even more challenging. It's a process of experimenting, calculating, documenting, then repeat everything over and over until finally my mentor said. . . you've got it!" Christopher 01.02.05
.

You can slide your finger down the piano graphic to verify actual linearity. Below the crystal dolphin is my tuning knob mounted under the center bracket.  "I became interested in bringing about progress in music, so that there would be more musical resources. I was not satisfied with the mechanical instruments in existence, of which there were many. They were all built using elementary principles and were not physically well done. I was interested in making a different kind of instrument. And I wanted, of course, to make an apparatus that would be controlled in space, exploiting electrical fields, and that would use little energy. Therefore I used electronic technology to create a musical instrument that would provide greater resources.... "    Lev Sergeyevich Termen

The RS Ultimate 2b has Linear Intervals of Notes with Keyboard Spacing "LINKS" of three octaves. 

The RS Ultimate 2b is very stable, the musical note positions remain linearly spread as seen above.

"Interesting fact: The electro-magnetic field that controls the theremin voice with your arm/hand interaction wants to be linear at all the piano octaves. The spacing of all the notes will be identical and match the piano key for key. Mathematical coincidence or  Lev's gift to you, unwrapped Christmas '04?"

"LINKS" reveals itself as a beautiful physics phenomenon Christopher 12.31.04