It's Brian Eno day! Developed by ambient music pioneer Brian Eno and musician/software designer Peter Chilvers, Bloom ($3.99, available here) explores uncharted territory for an iPhone app.

Part instrument, part composition, and part artwork, Bloom's intuitive controls allow anyone to create elaborate patterns and unique melodies simply by tapping the screen. A generative music player takes over when Bloom is left idle, creating an infinite selection of compositions and visualizations.

After testing it, we're completely entranced.

You can let Bloom run by itself and create a perfect ambient backdrop to whatever you're doing, then tap anytime to add your own elements to the composition. Controls let you customize the mood or shuffle between moods.