It's about 100 times as big as a King Size Bed.
In other words, 51 squares is 118 times the size of a King Size Bed, and the size of a King Size Bed is 0.00847 times that amount.(North American/Australian standard; length; mattress only)
A King-Size mattress measures 0.4340 squares in total area. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 0.5380 squares for those in positions of wealth or power.
It's about 450 times as big as a Bath Towel.
In other words, 51 squares is 437.170 times the size of a Bath Towel, and the size of a Bath Towel is 0.0022874 times that amount.(for Fieldcrest Luxury Solid Towels)
Bath towels typically measure 142.24 cm (56 in) by 76.2 cm (30 in), for a total area of about 0.116660 squares. The city of Bursa, Turkey is known as the birthplace of the modern towel.
It's about 4,500 times as big as an Airplane Tray Table.
In other words, 51 squares is 4,690 times the size of an Airplane Tray Table, and the size of an Airplane Tray Table is 0.000213 times that amount.(average)
With wide variation among different models of airplanes, in-flight tray tables measure around 41.2 cm (16.5 in) x 24.1 cm (9.5 in) for a total area of 0.0109 squares. Flight safety rules require that the tray tables be upright and locked during takeoff and landing so as to reduce the risk of passenger abdominal injury.
It's about 10,000 times as big as an Apple iPad.
In other words, 51 squares is 11,840 times the size of an Apple iPad, and the size of an Apple iPad is 0.000084460 times that amount.(for 9.7 inch, Apple iPad Air MD785LL/B)
An Apple iPad measures 23 cm (9.4 in) x 17 cm (6.6 in) for a total device area of 0.004308 squares. The base model iPad Air features 16 GB of storage capacity.
It's about 85,000 times as big as a Playing Card.
It's about 90,000 times as big as a Post-it® Note (3M).
In other words, 51 squares is 88,000 times the size of a Post-it® Note (3M), and the size of a Post-it® Note (3M) is 0.0000110 times that amount.(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 0.00058 squares in total area. In September, 1989, Hurricane Hugo swept through Charleston, South Carolina with winds up to 230 kph (140 mph), uprooting eight oak trees in Mr. Bruce Brakefield's yard, but leaving in place a Post-it® note attached to his front door.
It's about 600,000 times as big as a Secure Digital (SD) card.
In other words, 51 squares is 620,000 times the size of a Secure Digital (SD) card, and the size of a Secure Digital (SD) card is 0.00000160 times that amount.A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 0.0000830 squares. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.