The mobile app stores are bustling with meditation and wellness apps, each one promising to take you to a happy place. But there’s a certain oddity about seeking peace using a smartphone, mankind’s best-developed tool for timewasting and agitation. The cutesy-stark Forest takes a different tack. You set a timer and it plants a tiny seed, which grows into a tree with every second you manage not to click away from the app. Meditate, work, do what you will, but if you play with your phone the sapling gets it in the trunk. You can earn virtual gold and donate it to a tree-planting charity; repeated losers, however, may need another app to cope with all the anxiety over virtual herbicide.