"Mark off vertical and horizontal centerlines on plywood square, locating horizontal 22" from bottom edge. Using centerpoint A, scribe circle (note that pencil goes off three edges). Reset compass for 293/8", set point at B and strike arcs right and left, intersecting circle at C and D as above. Using same setting, move point to C and mark off F. Move point to D and mark off E. As check, set point at E to see if arcs cross at F. Join points with straightedge and cut out first pentagon with fine-tooth saw. True edges with fine wood rasp and finish with sandpaper on a block (hold rasp and block at 90 degrees to face of panel). Use this pentagon as template for layout of other 11. Just mark points on plywood squares and connect with straightedge. Note that a small triangle (with Vh" base) is nipped off at each corner. Cut 12"-radius hole at center of one pentagon to serve as access door." Read the full story in our November 1970 issue: Your Very Own Meditator