Are these blocks the same color? #STEMforKids via Groovy Lab in a Box

Groovy Sparks

GROOVY SCIENCE. GROOVY LIFE.

Two gray blocks stacked together with shaded black and highlights between them. The text reads "Are these blocks the same color?
Use your finger to cover the middle line. Are the blocks the same color or different?
Your eye sees color differently depending on what other colors they are beside."

Are these blocks the same color?

Use your finger to cover the middle line. Are the blocks the same color or different?

Your eye sees color differently depending
on what other colors they are beside.