The cat listens very carefully to what she is told, but does not always understand!The cat listens very carefully to what she is told, but does not always understand!
The moon is visible in the sky, but venus and mercury are not visibleThe moon is visible in the sky, but Venus and Mercury are not visible
Different pipes. bright lines on a gray backgroundDifferent pipes. Bright lines on a gray background
Spheres of different sizes and colors on a black backgroundSpheres of different sizes and colors on a black background