Add yours. A few of mine are:- 1. Butterflys. I used to see so many during summer but they have declined in big numbers to the point where i smile whenever i see one nowadays. 2.Tulips and Daffodils. Grew up where the garden of my childhood home had rows of these flowers every spring/summer, i have no garden now and miss these flowers. 3. Stars. It seems that the towns and cities have so much light during the night these days that its difficult to find space to stare at the night sky and be dazzled by the stars anymore, as a kid i used to look up and see so many but now... 4. Smell perception. I remember as a kid being able to smell the concrete when it was a hot day. Cannot describe the smell but as soon as i stepped out the back door into the sun filled garden it would be the first sensory delight of a play outside.