diff --git a/thinkcspy/Chapter-17-18-Exercises/rectangle.py b/thinkcspy/Chapter-17-18-Exercises/rectangle.py
index 4383467..4507c78 100644
--- a/thinkcspy/Chapter-17-18-Exercises/rectangle.py
+++ b/thinkcspy/Chapter-17-18-Exercises/rectangle.py
@@ -3,6 +3,11 @@ from points import Point
 class Rectangle:
     def __init__(self, pos, width, height):
         self.pos = pos
+        if width < 0:
+            width = 0
+        if height < 0:
+            height = 0
+
         self.width = width
         self.height = height
 
@@ -11,23 +16,15 @@ class Rectangle:
         self.lowerY = self.pos.getY()
         self.upperY = self.lowerY + self.height
 
-        if self.lowerX == self.upperX or self.lowerY == self.upperY:
-            return "Error: Rectangle not defined."
-
-        if self.lowerX > self.upperX:
-            self.lowerX = self.upperX
-            self.upperX = self.pos.getX()
-
-        if self.lowerY > self.upperY:
-            self.lowerY = self.upperY
-            self.upperY = self.pos.getY()
-
     def getWidth(self):
         return self.width
     
     def getHeight(self):
         return self.height
     
+    def getCoords(self):
+        return [self.lowerX, self.lowerY, self.upperX, self.upperY]
+    
     def __str__(self):
         return "Lower Left Coordinates: {}; Width: {}; Height: {}".format(self.pos, self.width, self.height)
     
@@ -57,17 +54,43 @@ class Rectangle:
         pnt = Point(self.width, self.height)
         return pnt.distanceFromOrigin()
     
-    def collission(self, pnt):
-        pntX = pnt.getX()
-        pntY = pnt.getY()
+    
+def collission(r1, r2):
+    conditionW = False
+    conditionH = False
+    bigR = r1
+    lilR = r2
 
-        if (pntX > self.lowerX and pntX < self.upperX) or (pntY > self.lowerY and pntY < self.upperY):
-            return True
+    if r1.area() < r2.area():
+        bigR = r2
+        lilR = r1
 
-        return False
+    lilArr = lilR.getCoords()
+    bigArr = bigR.getCoords()
 
-r = Rectangle(Point(-10, 5), 4, 30)
-#print(r)
-print(r.collission(Point(10, 25)))
-print(r.contains(Point(10, 25)))
-    
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+    # Compare widths and heights
+    if lilR.width > bigR.width:
+        if bigArr[0] in range(lilArr[0], lilArr[2] + 1) or bigArr[2] in range(lilArr[0], lilArr[2] + 1):
+            conditionW = True
+    elif lilArr[0] in range(bigArr[0], bigArr[2] + 1) or lilArr[2] in range(bigArr[0], bigArr[2] + 1):
+        conditionW = True
+            
+    if lilR.height > bigR.height:
+        if bigArr[1] in range(lilArr[1], lilArr[3] + 1) or bigArr[3] in range(lilArr[1], lilArr[3] + 1):
+            conditionH = True
+    elif lilArr[1] in range(bigArr[1], bigArr[3] + 1) or lilArr[3] in range(bigArr[1], bigArr[3] + 1):
+        conditionH = True
+
+    if conditionW and conditionH:
+        return "Collission!"
+
+    return "All safe for now."
+
+
+r = Rectangle(Point(10, 25), 10, 0)
+s = Rectangle(Point(10, 20), 10, 4)
+# print(r)
+# print(r.collission(Point(10, 25)))
+# print(r.contains(Point(10, 25)))
+
+print(collission(r, s))
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