My entry for Apophysis Challenge #152.

Tools and resources
Apophysis 2.09 - flame generation and rendering
  Built-in transforms: rings2
  Other transforms: polar2 (from [link])
  Gradient: Fire_&_Ice-11-76 from BDs Fire & Ice Gradients
Adobe Photoshop Elements 9 - postprocessing
  Sharpen
  Save for Web


Parameters
<flame name="I Wonder" version="Apophysis 2.09" size="1000 647" center="0 0.21" scale="300" oversample="1" filter="0.5" quality="50" background="0 0 0" brightness="5" gamma="4.5" gamma_threshold="0.25" >
<xform weight="0.5" color="0" rings2="1" coefs="0 1 -1 0 0.5 0" rings2_val="0" />
<xform weight="0.5" color="0" rings2="1" coefs="0 1 -1 0 0 0.5" rings2_val="0" />
<xform weight="0.5" color="0" rings2="1" coefs="0 1 -1 0 -0.5 0" rings2_val="0" />
<xform weight="0.5" color="0" rings2="1" coefs="0 1 -1 0 0 -0.5" rings2_val="0" />
<xform weight="0.5" color="1" polar2="0.35" coefs="1 0 0 1 0 -0.2" />
<finalxform color="0" symmetry="1" rings2="1" coefs="1.894913 0 0 -1.894913 0 0" rings2_val="1.2245" />
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</palette>
</flame>