Loom is a small drawing-based musical instrument. The lines of a drawing define pitches on specific musical scales. The vertical position refers to pitch, while horizontal alignment defines time-based rhythmic patterns. This initial state can be changed by rotating the drawing, so pitch becomes rhythm and vice versa. Players can experience the relativeness of these two concepts (x-axis = time, y-axis = pitch) in a funny and playful way. Loom is made with recent web technologies using P5JS for interaction and drawing, and WebPd for sound synthesis.