The pins are lined up in a triangle formation.
I would take a guess that it is 10 Pins on a Bowling Alley.
Bowling, and you play it at a bowling alley
Bowling in a bowling alley.
Because the ball is rolled down a specific lane or alley towards the pins.
10 Pins on a Bowling Alley
They are white so as to be seen easier from the other end of the alley.
Where the pins are placed is called "the deck". The area where they fall back into is called "the pit".
When you say, "Their living room is a bowling alley," you are using a metaphor. However, if they have children and the children have bowling pins, a ball, and use it as a place bowl, then it is not a metaphor, but simply a name.
Bowling alley bumpers are used to help young children get the ball too the pins. Most alleys have them and will install them when asked.
In the most common form of bowling in the US, ten pins are set up in a triangle.
they look somewhat like bowling pins with a really fat top
There are ten pins in ten pin bowling as that is the nature of that sport. In 5 pin bowling, there are 5 pins.