The folder should slide down when it’s icon is tapped, pushing everything below, just like the sailfish context menu does. We might consider flying the icons from the folder icon to their positions when the folder opens, but I don’t really know if this is too much animation.
The folder icon consists of the first four folder icons, at 90% of their normal size, overlayed and semi-transparent (0.6 opacity). Their follow the pattern below
If icon 1 is at coordinates 0,0 icon 2 has coordinates 6u,-6u icon 3 has -6u,6u and icon 4 6u,6u