easywhat am-i

What is as big as you are and yet does not weigh anything?
Common Wrong Answers
“Air”
Air takes up space and has weight, so it cannot fit the description of something that does not weigh anything.
“Reflection”
A reflection, like a shadow, is visible but it is often seen on a surface and can be considered as having a more tangible presence compared to a shadow.
“Ghost”
While a ghost might be perceived as weightless, it is a supernatural concept and does not fit the criteria of being something that is as big as you are in a physical sense.