I would just go with special button, the most straightforward simple solution you have direct control over. Also sometimes you might need to use the shower without mood lights and then system based on humidity or water flow will just be annoyance.

If you use some tools when showering, like brush or spung, you can make a contact sensor into the hook/holder (more work, probably need a custom 3D print), but should also work and you don’t need to press anything

Ah yes, sure, definitely about “warning that the proposed reform would add “complexity, bureaucracy and costs” rather than strengthen the single market” and definitely not about them being tax havens.

Cry me a river 🥲