My interpretation of this year's theme is
"My World" (ie, "Safer-at-Home") via Big Bertha, my Canon 600mm Lens.

Big Bertha (with her little buddies) has helped me to keep my sanity during the past 17 ½ months... "Home" also remains a refuge from the continuing (if not perhaps increasing) dangers out there. Being able to do daily Nature Photography at home (during a World "lock down") is very calming. It makes the world's current not-so-normal "New Normal" bearable.

Although I'm currently not able to safely travel to exotic photography locations like in the past, photographing what-is-now-available-to-me in my now reduced "personal world" makes it possible for a bit of life to still feel like the comfortable, old normal.

Above is my view of "Pandemic Lockdown" through the lens. Kind of upside-down, isn't it?
Really it's just the way a DSLR sees the world.

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World Photography Day 2021 – FAQ’s

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1. What is the theme of World Photography Day 2021?

Answer:
The theme for World Photography Day 2021 is
PANDEMIC LOCKDOWN THROUGH THE LENS


2. Why do we celebrate World Photography Day?

Answer:
The first photographic process was developed by Louis Daguerre. World Photography Day is a day to pay tribute to this great legend for his amazing discovery. It is also to mark a celebration of the present trends in photography and look forward to a bright future in the field.


3. When is World Photography Day?

Answer:
19th August of every year is celebrated as World Photography Day


4. Who started World Photography Day?

Answer:
World Photography day first came into being on account of the invention of the daguerreotype. The French government was the first to publicise the invention and make it freely available to the entire world.