It's about eight times as big as a Concrete Mixer Truck.
In other words, 123 perches is 7.8 times the size of a Concrete Mixer Truck, and the size of a Concrete Mixer Truck is 0.13 times that amount.(a.k.a. cement mixer, a.k.a. cement mixer truck, a.k.a. cement transport truck, a.k.a. concrete mixer, a.k.a. concrete transport truck, a.k.a. in-transit mixer)(standard size; drum capacity)
It's about one-twenty-fifth as big as a Hot Air Balloon.
In other words, the size of a Hot Air Balloon is 26 times 123 perches.(four-person capacity; envelope volume; average)
It's about one-thirtieth as big as an Olympic Swimming Pool.
In other words, the size of an Olympic Swimming Pool is 29 times 123 perches.(FINA regulation; (minimum capacity)
It's about one-sixty-fifth as big as The Goodyear Blimp.
In other words, the size of The Goodyear Blimp is 66.7 times 123 perches.(for GZ-20A) The Goodyear GZ-20 model Blimp measures 8,190 perches in total volume. A December, 1929 college football game between the University of Florida Gators and the University of Oregon Webfoots (later the University of Oregon Ducks) began with the blimp dropping a parachute-equipped ball from a height of 61 m (200 ft) to the field below.
It's about 100 times as big as a Hot Tub.
In other words, 123 perches is 120 times the size of a Hot Tub, and the size of a Hot Tub is 0.00833 times that amount.(for Lifesmart Rock Solid Simplicity Plug and Play 4 Person Spa With 12 Jets) (a.k.a. Spa, a.k.a. Jacuzzi, a.k.a. Whirlpool) (Advertised Capacity)
An average, four-person hot tub holds 1.03 perches of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about one-three-hundredth as big as The Lincoln Memorial Reflecting Pool.
In other words, 123 perches is 0.00337 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 297 times that amount.(Washington, D.C.)
It's about one-four-hundred-fiftieth as big as The Capitol Rotunda (US).
In other words, the size of The Capitol Rotunda (US) is 430 times 123 perches.(formally United States Capitol rotunda) (Washington, D. C.) (total chamber volume)