The mark consists of a triangle composed of three rows of diamonds with a base row of four triangles. All diamonds are split except the bottom middle diamond. The top diamond has green on the left and dark green on the right. The first diamond on the second row is yellow on the left and orange on the right. The second diamond of the second row and the last diamond of the third row are light green on the left and lime green on the right. The first diamond on the third row is lime green on the left and light green on the right. The middle diamond of the third row is fully shaded in lime green. All triangles on the bottom row are split. The first triangle is orange on the left and red on the right and the last triangle is red on the left and orange on the right. The second triangle is blue on the left and dark blue on the right and the third triangle is dark blue on the left and blue on the right. At the bottom of the mark is the wording "CASTELL PROJECT" in all uppercase letters where the word "CASTELL" appears in dark blue and the word "PROJECT" appears smaller than "CASTELL" and in lime green.