diff --git a/chunk.py b/chunk.py
index baf9efc..59ccae0 100644
--- a/chunk.py
+++ b/chunk.py
@@ -114,8 +114,9 @@ def get_tileentity_data(level):
     return data
 
 # This set holds blocks ids that can be seen through, for occlusion calculations
-transparent_blocks = set([0, 6, 8, 9, 18, 20, 37, 38, 39, 40, 44, 50, 51, 52, 53, 55,
-    59, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 79, 81, 83, 85, 92])
+transparent_blocks = set([ 0,  6,  8,  9, 18, 20, 27, 28, 37, 38, 39, 40, 44, 50,
+                          51, 52, 53, 55, 59, 63, 64, 65, 66, 67, 68, 69, 70, 71,
+                          72, 74, 75, 76, 77, 78, 79, 81, 83, 85, 92])
 
 # This set holds block ids that are solid blocks
 solid_blocks = set([1, 2, 3, 4, 5, 7, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,