diff --git a/columbus/entities.py b/columbus/entities.py
index 2ec78c4..bd9bbbe 100644
--- a/columbus/entities.py
+++ b/columbus/entities.py
@@ -15,9 +15,9 @@ class Entity(object):
         self.solid = False
         self.movable = False  # False = Non movable, True = Movable, x>1: lighter movable
         self.elasticity = 1
-        self.collision_changes_speed = False
+        self.collision_changes_speed = True
         self._crash_list = []
-        self._coll_add_pushback = 0.05
+        self._coll_add_pushback = 0
 
     def physics_step(self):
         x, y = self.pos
diff --git a/columbus/env.py b/columbus/env.py
index d23f196..22b1761 100644
--- a/columbus/env.py
+++ b/columbus/env.py
@@ -563,7 +563,10 @@ def parseObs(obsConf):
         obs = []
         for i, c in enumerate(obsConf):
             obs.append(parseObs(c))
-        return observables.CompositionalObservable(obs)
+        if len(obs) == 1:
+            return obs[0]
+        else:
+            return observables.CompositionalObservable(obs)
 
     if obsConf['type'] == 'State':
         conf = {k: v for k, v in obsConf.items() if k not in ['type']}
diff --git a/columbus/observables.py b/columbus/observables.py
index 4eeef7d..77bc3a4 100644
--- a/columbus/observables.py
+++ b/columbus/observables.py
@@ -9,18 +9,17 @@ import torch as th
 class Observable():
     def __init__(self):
         self.obs = None
-        pass
 
     def _set_env(self, env):
         self.env = env
 
     def get_observation_space():
         print("[!] Using dummyObservable. Env won't output anything")
-        return spaces.Box(low=0, high=255,
-                          shape=(1,), dtype=np.uint8)
+        return spaces.Box(low=0, high=1,
+                          shape=(1,), dtype=np.float32)
 
     def get_observation(self):
-        return False
+        return np.array([0])
 
     def draw(self):
         pass