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Draw a circle of 14cm diameter onto the timber square. Drill six 8mm wide holes at equal distances around the circle. Gently bend the rods to create a curving effect and tweak until they're all the same (try bending over the edge of an old table for more control).
Push the rods into the holes in the timber and position them so they curve outwards.
To secure the tops, weave a ring of garden wire around them, approximately 2cm thick, to the same diameter as the top of the obelisk.
Trellis and wigwams serve a practical purpose, but can also be focal points in their own right.
Push the wire ring over the ends of the rods to make a rim and bind it in place with 1mm wire. Add rings at regular intervals down the structure and attach with more wire.