I'm no artist Benoit .. enax, 'chelle or logiloglu are artists (as are some others over here) .. i'm still an apprentice learning from artists such as them :) @Misha: yep, already thought of mixing something into the water. Without having a kitty and my small one not beeing able to crawl for now, using milk may be a great idea. Will have to try that next weekend. Thanks a lot for that hint!!! @Kim: yep, that sink-method is the easier approach. But you loose some control (height and time of release) ... and as the light in our bathroom is even worse than in the living room, i'll have to continue using the dropper.