diff --git a/button.lua b/button.lua
index 87baba0..be86e7d 100644
--- a/button.lua
+++ b/button.lua
@@ -17,11 +17,11 @@ function m.new(text, callback, x, y, width, height)
         ty = (height - th) / 2
     }
 
-    btn.mousepressed = window.mousepressed(function(self, x, y, button)
+    btn.mousepressed = window.mousepressed(function (self, x, y, button)
         callback(x, y, button)
     end)
 
-    btn.draw = window.draw(function(self)
+    btn.draw = window.draw(function (self)
         love.graphics.printf(self.text, self.tx, self.ty, self.width)
         window.draw_border(self.width, self.height)
     end)
diff --git a/conf.lua b/conf.lua
index 02abbaa..95270a8 100644
--- a/conf.lua
+++ b/conf.lua
@@ -1,6 +1,6 @@
-WIDTH = 320
-HEIGHT = 240
-MULTIPLIER = 1.5
+WIDTH = 400
+HEIGHT = 300
+MULTIPLIER = 1.2
 
 function love.conf(t)
     t.window.width = MULTIPLIER * WIDTH
diff --git a/export.sh b/export.sh
index ddea6f1..20b8b36 100755
--- a/export.sh
+++ b/export.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
 
 rm garden.love
-zip garden.love *.lua
+zip -r garden.love res/ room/ *.lua
 cp garden.love ~/storage/downloads/
diff --git a/main.lua b/main.lua
index 80fac86..317507c 100644
--- a/main.lua
+++ b/main.lua
@@ -1,36 +1,46 @@
 -- Imports
 local window = require("window")
 local button = require("button")
+local rooms = require("rooms")
 
-local inventory = {
+local current_room = rooms['default']
+
+screen = {
+    x = 0, y = 60,
+    width = 320,
+    height = 240,
+}
+
+screen.mousepressed = window.mousepressed(function (self, x, y, button)
+    end)
+
+screen.draw = window.draw(function (self)
+    current_room:draw()
+    window.draw_border(self.width, self.height)
+end)
+
+inventory = {
     x = 0, y = 0,
-    width = WIDTH*0.7,
-    height = HEIGHT*0.2,
+    width = screen.width,
+    height = 60,
+    items = {}
 }
 
-inventory.draw = window.draw(function(self)
+inventory.draw = window.draw(function (self)
+    for _, item in ipairs(self.items) do
+        -- item:setpos(x, y)
+        item:draw()
+    end
     window.draw_border(self.width, self.height)
 end)
 
-local screen = {
-    x = 0, y = inventory.height,
-    width = inventory.width,
-    height = HEIGHT - inventory.height,
-}
-
-
-screen.draw = window.draw(function(self)
-    window.draw_border(self.width, self.height)
-end)
-
-local log = {
+log = {
     x = inventory.width , y = 0,
-    width = WIDTH*0.3,
+    width = 80,
     height = HEIGHT,
 }
 
-
-log.draw = window.draw(function(self)
+log.draw = window.draw(function (self)
     window.draw_border(self.width, self.height)
 end)
 
@@ -46,8 +56,15 @@ function love.update(dt)
     timer = timer + dt
 end
 
+mw, mh = 0, 0
+if love.system.getOS() == 'android' then
+    mw = (love.window.getWidth() - WIDTH) / 2
+    mh = (love.window.getHeight() - HEIGHT) / 2
+end
+
 function love.draw()
     love.graphics.push()
+    love.graphics.translate(mw, mh)
     love.graphics.scale(MULTIPLIER)
 
     screen:draw()
diff --git a/res/defaultbg.png b/res/defaultbg.png
new file mode 100644
index 0000000..2628d1e
Binary files /dev/null and b/res/defaultbg.png differ
diff --git a/room.lua b/room.lua
new file mode 100644
index 0000000..1577722
--- /dev/null
+++ b/room.lua
@@ -0,0 +1,51 @@
+local window = require('window')
+
+-- prototype of room
+-- - background
+-- - objects
+-- - edges
+local room = {
+    background = love.graphics.newImage("res/defaultbg.png"),
+    edges = {},
+    objects = {},
+}
+
+function edge_position(e)
+    local wd = screen.width - e.width
+    local hd = screen.height - e.height
+
+    local t = {
+        ['left'] = { 0, hd/2 },
+        ['right'] = { wd, hd/2 },
+        ['up'] = { wd/2, 0 },
+        ['down'] = { wd/2, hd },
+    }
+
+    local p = t[e.dir]
+    return p[1], p[2]
+end
+
+local mt = { __index = room }
+
+function room:new()
+    local m = {}
+    setmetatable(m, mt)
+    return m
+end
+
+room.mousepressed = window.propagate{'edges', 'objects'}
+
+function room:draw()
+    love.graphics.draw(self.background, 0, 0)
+    
+    for i, v in ipairs(self.objects) do
+        v:draw()
+    end
+
+    for i, v in ipairs(self.edges) do
+        local x, y = edge_position(v)
+        love.graphics.draw(edge_arrow[v.dir], x, y)
+    end
+end
+
+return room
diff --git a/room/default.lua b/room/default.lua
new file mode 100644
index 0000000..41f24d1
--- /dev/null
+++ b/room/default.lua
@@ -0,0 +1,7 @@
+local room = require('room')
+
+local r = room:new()
+
+r.background = love.graphics.newImage("res/defaultbg.png")
+
+return r
diff --git a/rooms.lua b/rooms.lua
new file mode 100644
index 0000000..d0b7ddf
--- /dev/null
+++ b/rooms.lua
@@ -0,0 +1,5 @@
+local m = {
+    ['default'] = require('room/default'),
+}
+
+return m
diff --git a/window.lua b/window.lua
index c1f6524..5160b41 100644
--- a/window.lua
+++ b/window.lua
@@ -1,4 +1,5 @@
--- primitive of drawing  objects
+-- function generator for window  functions
+
 local w = {}
 
 function w.draw(f)
@@ -20,6 +21,21 @@ function w.mousepressed(f)
     end
 end
 
+function w.propagate(tnames)
+    return function(self, x, y, button)
+        for _, tname in ipairs(tnames) do
+            for i, v in pairs(self[tname]) do
+                local x, y = x - v.x, y - v.y
+
+                if 0 <= x and x <= v.width and 0 <= y and y <= v.height then
+                    v:mousepressed(x, y, button)
+                    return
+                end
+            end
+        end
+    end
+end
+
 function w.draw_border(width, height)
     love.graphics.push('all')
     love.graphics.setLineWidth(5)