South-east rule

All blocks are 16 pixels in size (in all dimensions). It appears that the north and east edges of blocks is where they 'start'.

This has many effects in game:
 * When placing minecart tracks it will favor linking to the North or East edges.
 * Minecarts will favor South or West motion at a "T" due to the fact they favor 'starting' at the North or East edge.
 * The North and East faces of a block on fire will burn a player who touches those sides.
 * The Northeast corner of a block that has blocks to the North and East of it will effect its properties to a block (or player) touching that Northeast corner. All other corners are 'safe' since they have a South and/or West edge buffer.
 * Lava touching water does not create cobblestone, water trying to enter a lava block does.
 * A player, boat, or other NPC touching the Northeast corner of a water block can swim even if blocked on the North and East sides.