I'm blown away by Alexander Chen's interactive musical projects. These two pieces are minimal and so smart and beautiful at the same time.
I love this interactive music box of Bach's first cello suite he created. My husband and I both play cello, so this was really inspiring.
And this other project turns the New York subway system into a stringed instrument. When the subway lines intersect, they create the effect of plucked strings. He bases the visuals off the lines from Massimo Vignelli's 1972 diagram, which I think is the most beautiful version of the subway map.