A shadow is the dark outline an object makes when it blocks the light — same shape, but all black, no colour. You'll see a colourful object; find its matching black shadow from the four below.
🎨 Look at the colourful object's outline
🌑 A shadow keeps the shape but loses the colour
👆 Tap the black shadow with the same outline
Tip: a red umbrella and a blue umbrella cast the SAME shadow