When a hopper is placed 'facing' any direction, several pixels in either of the top corners on the side the block is 'facing' are swapped.
Attachments
Comments 1

When a hopper is placed 'facing' any direction, several pixels in either of the top corners on the side the block is 'facing' are swapped.
migrated
Erik Broes
Unconfirmed
Minecraft 1.8, Minecraft 1.8.1-pre2, Minecraft 1.8.8, Minecraft 15w43a
Minecraft 15w43c
Retrieved
15w43a