Pixel picture of a christmas tree on a white backgroundPixel picture of a Christmas tree on a white background
A bright picture on a dark background with a glow of colorA bright picture on a dark background with a glow of color
Silhouettes on a yellow background human evolutionSilhouettes on a yellow background human evolution
The sign of the number pi is made up of black digits on the background of a row of gray digitsThe sign of the number Pi is made up of black digits on the background of a row of gray digits