diff --git a/src/Dodge/Data.hs b/src/Dodge/Data.hs
index cb82f08f7..c2fd5ede5 100644
--- a/src/Dodge/Data.hs
+++ b/src/Dodge/Data.hs
@@ -357,7 +357,6 @@ data Creature = Creature
     , _crMvDir          :: Float
     , _crTwist          :: Float
     , _crID             :: Int
-    --, _crPict           :: Creature -> Configuration -> World -> SPic
     , _crPict           :: Creature -> SPic
     , _crSkin           :: CreatureSkin
     , _crUpdate         :: Creature -> World -> World
@@ -945,6 +944,7 @@ data Block = Block
     , _blHP         :: Int
     , _blShadows    :: [Int]   -- a list of blocks/walls? that are not shown when this block exists
     , _blFootprint  :: [Point2]
+    , _blObstructs  :: [(Point2,Point2)]
     , _blPos        :: Point2
     , _blDir        :: Float
     , _blDraw       :: Block -> SPic
diff --git a/src/Dodge/Default/Block.hs b/src/Dodge/Default/Block.hs
index 8d5941d77..c7813c4c8 100644
--- a/src/Dodge/Default/Block.hs
+++ b/src/Dodge/Default/Block.hs
@@ -14,6 +14,7 @@ defaultBlock = Block
     , _blDir       = 0
     , _blDraw      = const mempty
     , _blDeath     = makeBlockDebris
+    , _blObstructs = []
     }
 defaultDirtBlock :: Block
 defaultDirtBlock = defaultBlock & blHP .~ 50
diff --git a/src/Dodge/Placement/PlaceSpot/Block.hs b/src/Dodge/Placement/PlaceSpot/Block.hs
index 671fcd3a1..1aa411e7a 100644
--- a/src/Dodge/Placement/PlaceSpot/Block.hs
+++ b/src/Dodge/Placement/PlaceSpot/Block.hs
@@ -88,6 +88,7 @@ placeLineBlock basePane blockWidth depth a b gw = ( 0
         , _blHP = 1000, _blShadows = shadowsAt i
         , _blDir = 0    -- THIS IS NOT SENSIBLE. TODO rethink block positioning
         , _blFootprint = cornersAt p -- TODO check winding (clockwise, anticlockwise)
+        , _blObstructs = []
         , _blPos = p, _blDraw = const mempty , _blDeath = makeBlockDebris}
     insertBlocks = flip (foldr insertBlock) $ zip is blockCenPs
     ksAtI i = map ( + (wlid + i*4) ) [0,1,2,3]