This is so called because the paintings seem to resemble a city in the distance and notably have a horizon.
Originally in 1966 I did a small painting which was about objects in a room. They were sitting in space, no detail, just blocks of colour and they were floating in a grey background. Using only blocks of colour to indicate the objects in space.
Then, years later I began to do a painting with simple blocks of colour, very similar to the original. In these later paintings there is an introduction of a horizontal line i.e. the horizon. The sense of a landscape by the locks of colour were the only things in the painting and I began to realise that once you limit yourself to just a scenario of a number of blocks then you could really start to play with the colours and see what they did to each other. Within the little area of the canvass I gradually realised that the moods and tensions were set up by these blocks of colour and their positions.
Limiting myself seemed to open up more possibilities. The paintings now started to range in size from very small up to 2m by 1.5 metres.