When looking at a sofa, it is crucial to stand up facing the sofa and looking straight at where the chaise is located. If the chaise is on the left, then we call it a "Left Chaise" and similarly for when the chaise is on the right - as per IKEA's standards. So if you're sitting down, your right hand will be on the armrest of a "Left Chaise Sofa". Hope this clears things up!