Oi is a South African telecommunication brand that features an interactive logo design by Wolff Olins that shifts in shape and color in response to the consumer's voice. The logo is fully malleable in its abstract blob design to move in response to the different pitch's in a person's voice that is nearby. The design offers a much more interactive brand emblem that engages the consumer as well as the brand's telecom services by reacting in response to their voice.
The logo is an abstract bobble that features the brand name Oi in the centre in a white typeface. When consumers are close to the logo, the emblem shifts in shape and color as it reacts to the different pitch levels. The different colors allude to the tone of the voice. For example, bluer colors depict a quiet and calm sound whereas vibrant reds denote higher pitches.