So now the creative part - shape your spiral (clockwise or anticlockwise - as you wish), using a shovel, rake, or even your hands to get a nice regular slope, with the terraces about 20cm wide (not including width of bricks).

Start at the top and place bricks following the spiral you have shaped. Try not to leave too big spaces between the bricks as this will allow soil to fall to the next level when you are watering. Broken or half bricks are useful at the top to get a more aesthetic curve.