Okey dokey! Here's my challenge. It's a little different from my original idea because we all seem to want to learn a little more about functions and skies... 1. pick one of the really wacky colorful atmospheres in vue. I suggest alien ballet, strange purple, strange red, or busy sepia aliens 2. you may (and should) change any FUNCTION that's used to make the sky. This is done by going to the cloud editor and doing "edit material" on each of the cloud layers. Then in the material editor click on the grey function ball and choose "load function." Load any function that you like and observe the results. Remember, the material uses functions for color, bump, and sometimes highlight, transparency, and underlying material. Edit every material in the sky editor and load functions for each of them. If you're feeling ambitious you can edit the functions instead! 3. You may (but don't have to) load different filters as well 4. you may NOT change color maps, whole materials, light color, fog, haze, etc or move the sun, or otherwise alter stuff that isn't function-related. 5. the goal here is to make your new sky look as different as possible from the original simply by messing with the functions. So render before and after pix and post them! Whoever creates the biggest difference between original and final atmospheres wins. 6. If you need help with changing functions, by all means ask for it because this isn't about who has the most technical skill. I'll be happy to post a full walkthru for anyone who isn't able to figure out the steps. ok, 2 weeks, GO! MaryCanary