I really love how Japanese scrupulously make enhancements to everything. The above paper cup lid is an example. The plastic cover looks odd at first, but turns out rationally designed. As it is made from thin plastic, you can tear the patch along the slight cut on the edge, folding it backward until it rests well on the button in the middle. Besides its full function of a lid (avoid spill-over, retain warmth, prevent dust, etc.) this design creates a mouth to drink from and keeps the torn-off patch from interfering with your drinking. I really like it. I love how miniature improvements in trifle things make life more convenient.