The pen is tucked inside the doctor’s coat pocket, while the small red apple appears on the wall behind the nurse. The egg is more cleverly hidden, with the shape of the nurse’s collar forming its outline.
The fourth object is where the puzzle becomes tricky. After searching the entire picture for a flower, viewers eventually discover that there actually isn’t one hidden anywhere in the scene.
That missing flower is the real trick. Because the puzzle tells you four objects exist, your brain expects to find all four and may start interpreting random shapes as a flower. The challenge is therefore testing not only eyesight, but also how easily expectations can influence what we think we see.
