We can also compare this to grid. Grid gets you ... well, a grid. Which can sometimes lead to gaps when items don't all have the same size. It's easy to think that grid-lanes is basically a grid without the gaps. So let's remove the gaps, virtually, from this grid. And now let's switch the grid-lanes. Again, big difference in the flow of items. The placement algorithm is very different between grid-lanes and grid. So, keep in mind, grid-lanes doesn't start from grid and then squishes everything closer together. It fills lanes item by item, always making a decision as to which lane is shortest.