ASUS have just launched their "100 Days of Zen" campaign where everyday for the next 100 days, one winning photo will get their photographer a free ASUS ZenFone 2 smartphone. Done in collaboration with Robert Jahns (otherwise known as nois7 on Instagram) all you have to do to enter is download an image by Robert from the site and add a little something of your own (keep it G-rated please). Hashtag this collaboration creation with #100DaysOfZen and post it on Twitter, Instagram and Facebook. Check out the sample below and then go to the 100DaysOfZen site for more information. Robert Jahns used the ASUS ZenFone 2 to do all of the photos being used in the contest and if you need a few more details about the smartphone do check out our ASUS ZenFone 2 ZE551ML review as well.