Well there was only one guess for this week's WIIW
Linda G disagreed with the statement: "Easier? You must be kidding!"
Well Linda I have to say it was easy because your throwaway guess: "Looks like a demented termite's path over a piece of petrified wood to me. *grin*"
Is so close to the truth I have to give you 100%
Not petrified wood, it is tree bark. Not a termite, but a moth larvae.
Meet a Scribbly Gum, this common Eucalyptus is so named because the boring caterpillars leave these amazing marks on their bark. This is one where they have been particularly busy!