In the future Navisens hopes to be able to display that orientation in the form of, perhaps, a small green triangle - which has obvious appeal to potential advertisers seeking out ways to know how, where and when potential customers are almost face-to-face with their products.

BBC: Technology that works behind closed doors

Those elements are traditionally performed by three instruments: a triangle, an accordion, and a zabumba, a drum pitched somewhere between a low snare and a small bass.

NPR: Northern Brazilian Tradition, New York Style