What was vassily kandiskys main innovation in art?

Natural minor half steps between scale degrees 3 and 4; 7 and 8 harmonic minor half steps between scale degrees 2 and 3; 5 and 6 ascending melodic minor half steps between scale degrees 2 and 3; 5 and 6; 7 and 8 major half steps between scale degrees 2 and 3; 7 and 8

What does bts stand for? what is the importance of bts? who first started it?

How did the scholars date the mosaic?