Why a spoon will allow one to “appear” up-side down on one side and right-side up on the other side?
A spoon forms an inverted real image of you when you look into the concave (hollow) side. This real image is located a few centimeters in front of the spoon, where you can touch it with your finger or insert a small piece of paper into it. Try it, you will see the pattern of light appear on the paper sliver. A spoon forms a right side up virtual image of you when you look into the convex (bowed outward) side. This virtual image is located a few centimeters behind the spoon. You appear very small because it is a small virtual image that you are looking at. You cannot touch this virtual image.