Tactility
Tactility is underappreciated. After all, an object needs to be touched to be fully understood.
Physical tools are often more fun than their virtual counterparts because of their tactility; this phenomenon is called the fiddle factor. The Force Touch trackpad and the Taptic Engine bring some liveliness to the virtual worlds.
Tactile items also have a practical benefit: they can be easily used in the dark. Tactile switches convey a sense of certainty.
I aim for everything that I touch to have a lovely lindy feel. Enjoy the paper tickets while they last.