It's about nine-tenths as big as a Tennis court
In other words, 0.023 hectares is 0.881659320 times the size of a Tennis court, and the size of a Tennis court is 1.1342250 times that amount.(per ITF specification; for doubles)
Per International Tennis Federation Rules of Tennis 2009, a doubles tennis court should measure 23.7744 m long by 10.9728 m, for a total area of about 0.026076 hectares. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
It's about two-thirds as big as an IMAX screen
In other words, 0.023 hectares is 0.64940 times the size of an IMAX screen, and the size of an IMAX screen is 1.540 times that amount.(standard)
An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 0.03542 hectares. Because the film used in an IMAX movie is more than eight times larger than regular film, the platters of a two-and-a-half hour feature film can weigh up to 250 kg (550 lbs).
It's about half as big as a Basketball court
In other words, 0.023 hectares is 0.46404862150 times the size of a Basketball court, and the size of a Basketball court is 2.1549466020 times that amount.(per NBA regulation)
Per NBA rules , a basketball court should measure 29.5656 m long by 16.764 m wide, for a total area of 0.04956377184 hectares. The first basketball game, held in a Springfield Massachusetts YMCA, was played on a court half the size of today's NBA standard and ended with a score of 1-0.
It's about one-fifth as big as Fort Knox
In other words, 0.023 hectares is 0.1950 times the size of Fort Knox, and the size of Fort Knox is 5.130 times that amount.(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 0.1180 hectares. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.
It's about one-fifth as big as Manchester Cathedral
In other words, 0.023 hectares is 0.18580 times the size of Manchester Cathedral, and the size of Manchester Cathedral is 5.3820 times that amount.(a.k.a. Cathedral and Collegiate Church of St Mary, St Denys and St George) (Manchester, England, United Kingdom) (total interior area of Nave, Chapel, Library, Chapter House, and Rectory)
Manchester Cathedral includes a total interior area of 0.12380 hectares between the Nave, Chapel, Library, Chapter House, and Rectory. The height of the Cathedral's bell tower is 41.1 m.
It's about one-fifth as big as a Hockey rink
In other words, 0.023 hectares is 0.1516321480 times the size of a Hockey rink, and the size of a Hockey rink is 6.594907570 times that amount.(per NHL specification)
Per National Hockey League Official Rules, a hockey rink should measure 60.96 m long by 25.908 m wide with a corner arc radius of 8.5344 m, for a total area of about 0.1516828740 hectares. Ice hockey is believed to have developed from field hockey after players began holding games on ice rinks, which had been traditionally used for the sport of curling.
It's about fifteen-and-a-half times as big as a Parking Space
In other words, the size of a Parking Space is 0.0654 times 0.023 hectares.(a.k.a Parking Stall) (average; surface lot; North America)
An average-size parking space in a North American surface lot measures 0.0015 hectares. Due to the high real estate prices at the time, parking spaces in a densely-populated part of Manhattan would sell for an average of $165,000 in 2007, with some spaces fetching up to $225,000.