diff --git a/icon.png b/icon.png
new file mode 100644
index 0000000..668d3a0
Binary files /dev/null and b/icon.png differ
diff --git a/panel.py b/panel.py
new file mode 100644
index 0000000..1a80e87
--- /dev/null
+++ b/panel.py
@@ -0,0 +1,91 @@
+from random import random
+import wx
+
+from slic.gui.widgets import LabeledMathEntry 
+from slic.gui.widgets import make_filled_hbox, make_filled_vbox
+from slic.gui.widgets.plotting import PlotPanel
+
+
+class MainPanel(wx.Panel):
+
+    def __init__(self, parent):
+        super().__init__(parent)
+
+        self.beans = []
+        self.spilled = []
+
+        btn_minus = wx.Button(self, label="-")
+        btn_plus  = wx.Button(self, label="+")
+        btn_check = wx.Button(self, label="?")
+
+        btns = (btn_minus, btn_plus, btn_check)
+        hb_btns = make_filled_hbox(btns)
+
+        self.le_beans = le_beans = LabeledMathEntry(self, label="How many beans?", value=0)
+        self.le_spilled = le_spilled = LabeledMathEntry(self, label="Spilled beans:", value=0)
+        le_spilled.Disable()
+
+        self.plot_beans = plot_beans = PlotPanel(self)
+        self.plot_spilled = plot_spilled = PlotPanel(self)
+
+        plots = (plot_beans, plot_spilled)
+        hb_plots = make_filled_hbox(plots)
+
+        widgets = (hb_btns, le_beans, le_spilled, hb_plots)
+        box = make_filled_vbox(widgets, border=10)
+        self.SetSizerAndFit(box)
+
+        btn_minus.Bind(wx.EVT_BUTTON, self.on_click_minus)
+        btn_plus.Bind(wx.EVT_BUTTON, self.on_click_plus)
+        btn_check.Bind(wx.EVT_BUTTON, self.on_click_check)
+
+
+
+    def on_click_minus(self, _event):
+        le = self.le_beans
+        current = le.GetValue()
+        le.SetValue(current - 1)
+        self.update_plot()
+
+    def on_click_plus(self, _event):
+        if random() < 0.9:
+            le = self.le_beans
+        else:
+            le = self.le_spilled
+        current = le.GetValue() or 0
+        le.SetValue(current + 1)
+        self.update_plot()
+
+    def on_click_check(self, _event):
+        percent = self.get_percentage()
+        msg = f"You spilled {percent:.2}% of the beans."
+        self.le_beans.SetValue(0)
+        self.le_spilled.SetValue(0)
+        wx.MessageBox(msg, "Spillage Stats", wx.OK|wx.ICON_WARNING)
+
+    def get_percentage(self):
+        b = self.le_beans.GetValue() or 0
+        s = self.le_spilled.GetValue() or 0
+        return s / b * 100
+
+
+    def update_plot(self):
+        self.store_values()
+        self.draw_plot()
+
+    def store_values(self):
+        b = self.le_beans.GetValue() or 0
+        s = self.le_spilled.GetValue() or 0
+        self.beans.append(b)
+        self.spilled.append(s)
+
+    def draw_plot(self):
+        self.plot_beans.clear()
+        self.plot_spilled.clear()
+        self.plot_beans.plot(self.beans)
+        self.plot_spilled.plot(self.spilled)
+        self.plot_beans.draw()
+        self.plot_spilled.draw()
+
+
+
diff --git a/start.py b/start.py
new file mode 100755
index 0000000..5cef6d7
--- /dev/null
+++ b/start.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+import os
+import wx
+
+from slic.gui.persist import Persistence
+
+from panel import MainPanel
+
+
+def run(*args, **kwargs):
+    app = wx.App()
+    frame = MainFrame(*args, **kwargs)
+    frame.Show()
+    app.MainLoop()
+    app.Yield() #TODO: without this, wxPython segfaults locking a mutex
+
+
+def get_wx_icon(fname="icon.png"):
+    iname = os.path.dirname(__file__)
+    iname = os.path.join(iname, fname)
+    return wx.Icon(iname)
+
+
+
+class MainFrame(wx.Frame):
+
+    def __init__(self, title="Coffee 365"):
+        super().__init__(None, title=title)
+        self.SetIcon(get_wx_icon())
+
+        main = MainPanel(self)
+
+        # make sure the window is large enough
+        sizer = wx.BoxSizer(wx.VERTICAL)
+        sizer.Add(main, proportion=1, flag=wx.EXPAND)
+        self.SetSizerAndFit(sizer)
+
+        self.persist = persist = Persistence(".coffee365", self)
+        persist.load()
+
+        self.Bind(wx.EVT_CLOSE, self.on_close)
+
+
+    def on_close(self, event):
+        self.persist.save()
+        event.Skip() # forward the close event
+
+
+
+if __name__ == "__main__":
+    run()
+
+
+