Usability: jalousie

I have difficulties...Every time to understand which string should be pulled in order to open or close jalousie I have to examine what's going on above and where the limiters are placed. Or to detect the required string by the hit-and-miss method. The problem of visual indication is easy to solve — I just have to paint the string into gradient color ring. Now jalousie are closing if blue color is closer to you. The opened question is tactile indication. How the beads shape should be changed so that the fixing mechanism could work and in the same time it would be convenient to pull both bottom-up and up-bottom? Cool idea — thanks to mikhail_maximov: As a variant — stick a nail into a wall so that the string will catch on it and you'll be happy: left up — to open, right up — to close, if you'll pull the string the other way the action will be inversed ;-) But we still need the visual indication, it can be implemented just by grey gradient — if you wish to close jalousie, you should pull down the darker part of string.