Pyramid structure

double posX = event.getPos().getX();
            double posY = event.getPos().getY();
            double posZ = event.getPos().getZ();
            event.getWorld().setBlockState(new BlockPos(posX,posY,posZ), Blocks.FLOWING_WATER.getDefaultState());
            event.getWorld().setBlockState(new BlockPos(posX + 1,posY,posZ), Blocks.SANDSTONE.getDefaultState());
            event.getWorld().setBlockState(new BlockPos(posX - 1,posY,posZ), Blocks.SANDSTONE.getDefaultState());
            event.getWorld().setBlockState(new BlockPos(posX,posY,posZ + 1), Blocks.SANDSTONE.getDefaultState());
            event.getWorld().setBlockState(new BlockPos(posX,posY,posZ - 1), Blocks.SANDSTONE.getDefaultState());
            event.getWorld().setBlockState(new BlockPos(posX + 1,posY,posZ + 1), Blocks.STONE_SLAB.getStateFromMeta(1));
            event.getWorld().setBlockState(new BlockPos(posX + 1,posY,posZ - 1), Blocks.STONE_SLAB.getStateFromMeta(1));
            event.getWorld().setBlockState(new BlockPos(posX - 1,posY,posZ + 1), Blocks.STONE_SLAB.getStateFromMeta(1));
            event.getWorld().setBlockState(new BlockPos(posX - 1,posY,posZ - 1), Blocks.STONE_SLAB.getStateFromMeta(1));