How to make a spiral amphitheatre in sketchup like the one in Darling Harbour (Sydney)?

Can anyone please help with this?

Here’s a single start. Note this could be done a number of ways.

Here I created two spirals using the Archimedes Spiral tool in the Curve Maker extension. I connected the ends with edge segments, used Curviloft to create a surface and then Vector Push/Pull in Joint Push/Pull to extrude the shape downward.

Another option: A single Archmedes spiral with Curve Maker, a rectangle for the step profile, and Eneroth Upright Extruder.

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That helps! Thanks a lot DaveR!