I loved doing this during elementary school, especially in May and June when the grass was lush and green. It was so calming..the smell, the texture, the crunchy sound, the repetition, the whole experience. 
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Backstory: diagnosed with borderline,"tentative" Aspergers at 7, but don't fit the criteria now (according to my longtime psychiatrist). I self-identify as having ASD traits rather than the whole diagnosis.
Mostly keeping a distance from ASD-related things (including WP) but I'll always be interested in it despite the recent separation of it from my identity.