Golden Grid System (GGS) splits the screen into 18 even columns. The leftmost and rightmost columns are used as the outer margins of the grid, which leaves 16 columns for use in design.

Now, 16 columns sounds a bit much for anything other than huge widescreen monitors. This is where the folding, inspired by the DIN paper system and Unigrid, comes in. The 16 columns can be combined, or folded, into 8 columns for tablet-sized screens, and into 4 columns for mobile-sized ones. This way GGS can easily cover any screen sizes from 240 up to 2560 pixels.

A responsive CSS grid system helping desktop and mobile browsers play nicely together.

A good demo page showing a fluid 16 column grid, in conjuction with mooTools.

Nice chart showing how the world's wired up.