Likewise, when we're describing the ring structures of sugar molecules, to basically describe the stereochemistry of the ring structure in that sugar molecule, we use the Horworth projection. And these are examples of Horworth projections. And so in the Horworth projection, what we have is these thick bonds are the bonds that are coming out of the board. So these bonds here are coming out of the board and they're essentially perpendicular to the plane of the board. So these atoms here are basically coming out of the board. And so what that means is, for instance, this hydroxyl group points upward and this hydrogen group points downward.