About porthole
A porthole, sometimes called bull's-eye window or bull's-eye, is a generally circular window used on the hull of ships to admit light and air. Though the term is of maritime origin, it is also used to describe round windows on armored vehicles, aircraft, automobiles and even spacecraft.

Porthole

blue and brown horse print round wall decor
blue and brown horse print round wall decor
airplane window during daytime
airplane window during daytime
airplane window view of clouds during daytime
airplane window view of clouds during daytime
airplane window view of clouds during daytime
airplane window view of clouds during daytime
A dark aircraft interior in economy class: the row of modern empty leather seats with armrests down, shallow depth of field, selective focus on the elbow rest in the foreground, rag mat under the head
A dark aircraft interior in economy class: the row of modern empty leather seats with armrests down, shallow depth of field, selective focus on the elbow rest in the foreground, rag mat under the head
closed brown metal door
closed brown metal door
round brown wooden window
round brown wooden window
sea waves crashing on shore during daytime
sea waves crashing on shore during daytime
man looking at window inside plane
man looking at window inside plane
plane window photo of Empire State Building
plane window photo of Empire State Building
Passenger seats interior of salon view of the interior of an empty passageway
Passenger seats interior of salon view of the interior of an empty passageway
clear white skies from plane's window view
clear white skies from plane's window view
silver and black round ring
silver and black round ring
gray clouds during daytime
gray clouds during daytime
round clear glass mirror near white pillows
round clear glass mirror near white pillows
round glass window
round glass window
View through opened vessel porthole of a tiny island surrounded by ocean water in the evening, with silhouettes of people on it and a stunning sunset cloudscape above, Maldives
View through opened vessel porthole of a tiny island surrounded by ocean water in the evening, with silhouettes of people on it and a stunning sunset cloudscape above, Maldives
window showing sea during daytime
window showing sea during daytime
white and black ship
white and black ship