Small change

entity.lua

@@ -65,6 +65,7 @@ m.mousepressed = window.mousepressed(function (self, x, y, button)
 end)
 
 function m:install(room, x, y)
+    self.room = room
     self:setpos(x, y)
     room:insert(self)
 end

item.lua

@@ -30,12 +30,14 @@ function m:itemMode()
     end)
 end
 
+local install = m.install
 function m:install(room, x, y)
-    local i = self:new()
-    i.room = room
-    i:pickupMode()
-    i:setpos(x, y)
-    room:insert(i)
+    self:pickupMode()
+    install(self, room, x, y)
+end
+
+function m:spawn(room, x, y)
+    self:new():install(room, x, y)
 end
 
 return m