Foe most of the year, my painting 'Limners' has all it's doors open or all closed, depending on whether my pop-up gallery is operating or not.
However, at this time of year, as its based on an advent calendar, each door is opened separately depending on the date. (you can see it displayed on my latest Facebook and Instagram posts)
Their are 37 doors behind which are tiny paintings relating to our family Christmas. If we have visitors I ask them to open the latest window. My grandchildren often ask why there is no chocolate inside - but there is no pleasing some people!