Minecraft Lighthouse Build Guide - Circles All the Way Up A lighthouse is just a tall circle with stripes. Start with a diameter 9 outline for the base - it needs only 24 blocks per layer - and alternate two or three layers of white concrete with two layers of red. The stripes make any small mistake easy to spot and fix while you build. Near the top, step in to a diameter 7 circle for the lamp room, ring it with glass, and put a glowstone or sea lantern core inside. A campfire or a beacon beam on top finishes the look. Lighthouses read best from far away, so keep the proportions tall and slim: at least three times as many layers as the diameter is wide. Plan your own circle here: circle maker minecraft