The title is referring to the yearly challenge here in April, to highlight just one subject during this whole month. It's hosted by @northy and it's great fun :) 30-shots2021 is the tag.
This is our staircase and it's so tempting to take this as my subject. But, I won't because I can't take it with me and photograph it, as I'm residing in different places this month. So, another subject is needed. Some more thinking to do;)