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I recently came across this piece:

73878

What piece is it, and how can it be used?

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The part is Window Round 3 x 3 x 2 (73878).

73878

It was a new mold for 2021, and one of its first uses was as windows on Andrea's House (41449).

Andrea's House

This piece can be used on buildings anywhere you'd like a curved window. It is easy to imagine how it could have been used on earlier sets, such as the "curved" windows on the Pet Shop:

10218 Pet Shop

This part introduces opportunities for curved windows, but it continues to use existing window glass. It uses the 1x2x2 glass (60601):

60601

This means that the part is also compatible with other window panes, such as the 1x2x2 bars:

38320

These parts are paired together to create the curved window seen in Chamber of Secrets (76389):

76389 Tower Window

Like most parts, there's plenty of ways to use it. It shows up as fences in Heartlake City Park (41447):

https://rebrickable.com/sets/76389-1/hogwarts-chamber-of-secrets/

It even gets used to create a water wheel in Medieval Castle (31120):

31120 water wheel

I played around a little with this part at microscale and put together a Mars research station based around the idea of round pods:

Mars Research Station

Mars Research Station top

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  • The curved window brick would not have been a good choice for the pet shop: half-hexagonal bay windows were a common feature of the architecture of that period; curved ones were unheard-of.
    – Mark
    Jul 26 at 20:55

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