[ckcheng]

I think they trained on one too many closet bifold doors [1].

If you look at the edge of the doors as they swing open, it seems their movement resembles bifold door movement (there's a wiggle to it common to bifold doors that normal doors never have). Plus they seem to magically reveal an inner fold that wasn't there before.

[1]: https://duckduckgo.com/?t=h_&q=interior+bifold+closet+doors&...