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[@ericrav](/creator/twitter/ericrav)
"seeing spring animation physics as a product of these X curves really clicked for me more than the physical spring metaphor ever did from a wwdc video referenced in @emilkowalski_'s animation course"  
[X Link](https://x.com/ericrav/status/1978845710024872121) [@ericrav](/creator/x/ericrav) 2025-10-16T15:29Z XXX followers, XX engagements


"@emilkowalski_ using perceptual duration and bounce as parameters is also so much nicer than mass stiffness and damping. but i wasted so much time trying to make it work because the conversion formula in the wwdc video is wrong"  
[X Link](https://x.com/ericrav/status/1978846847054553446) [@ericrav](/creator/x/ericrav) 2025-10-16T15:33Z XXX followers, XX engagements


"@emilkowalski_ @k_grajeda seems like the perceptual duration is always at the trough of the curve after the first peak. which works well for most bounce values but makes less sense as you go XXX unless i have something wrong"  
[X Link](https://x.com/ericrav/status/1978853986191933792) [@ericrav](/creator/x/ericrav) 2025-10-16T16:02Z XXX followers, XX engagements