The network's original logo was an oval-shaped letter "C", the inside shaped like a television tube. Contained within the C were the initials "CTV". In 1966, colour programming was ushered in with a new logo, depicting a red circle containing the initial "C", a blue square with a "T", and a green inverted triangle with a "V". This logo has been used, albeit with minor variations along the way ever since. In 1967, the letters "CTV" were rounded and easier to see, with the "base/TV" graphic added later.