Go through these steps: Choose a document class: documentclassarticle, load the TikZ package: usepackagetikz, begin the document: begindocument, begin a TikZ picture environment: begintikzpicture. The radius of each circle. The green pegs represent qualities that both Item 1 and Item 2 have in common. Its mixing colors in a certain way. Luminosity: This is the inverse of color; the resulting color has the luminosity of the foreground and the hue and saturation of the background. Exclusion: This is like difference, but with lower contrast. Try it here now.