I was hit by that thought last week whilst changing a seal in a Geberit (concealed cistern toilet). The engineering that has gone in to making a mechanism that

I was hit by that thought last week whilst changing a seal in a Geberit (concealed cistern toilet). The engineering that has gone in to making a mechanism that will work under water for decades , and can be entirely disassembled and reassembled through an opening the size of the flush panel, is pretty incredible