hey was up guys, so i am updating my texture pack early waiting on 1.4 to update and as i was updating i was looking through the 12w34b snapshot i the terrain.png and i found this weird 2 blocks inside, i have never seen them in-game. If you guys have any clue what they are or relate to make sure to comment below on this post or on my video, one of them is on the left of the item frame block and one is below the emerald block. Maybe they can be some hidden feature, i am very confused but if you know what it is comment below.

Minecraft 1.4 12w34b Snapshot: http://www.mojang.com/2012/08/minecraft-snapshot-12w34b/
Youtube Video Link: http://www.youtube.com/watch?v=5WB2SpS_pkU&feature=plcp