Has anyone tried a caked like this? I can't tell whether it's buttercream or fondant?
I haven't tried it myself but it looks like fondant to me. I found this tutorial which isn't exactly the same but looks like a similar concept.
Yes, I too think it's fondant. But what the heck are all those hair lines at the base?
Some cakes are so close to the line, it's hard to tell, but I believe that cake is buttercream by a skilled operator, done with a tip.