I think I've figured out what this plastic tub with its little wheels reminds me of!
(Each time I use kdenlive I seem to figure it out just a little tiny bit more. …Only a tiny bit though.)
[Alt text: clear plastic tub with tiny plastic wheels rolls into view. Then with a "ding" it changes to a screenshot of a Minecraft minecart with a player sitting in it. (The player skin is Spider-Man, so it's me, of course…)]