The mark consists of letters that form the word TOPSTONE, the letter T having a font and a font size different than the font of the letters OPSTONE, which are uniform in font. The letter T features a crown directly above and on the letter, a theater mask depicting a happy face to the left of the letter, and a theater mask depicting a sad face to the right of the letter, the theater masks each including the letter "T" forming a uniform set of eyebrows and a nose. Below the word TOPSTONE are letters that form the word INDSUTRIES having the same font as the letters that form OPSTONE. The letters of INDUSTRIES have a smaller font size than the letters of TOPSTONE and are more spaced apart relative to each other than the letters of TOPSTONE are to each other.