It's about four times as big as a Tennis Ball
In other words, 40 tablespoons is 3.7550 times the size of a Tennis Ball, and the size of a Tennis Ball is 0.26630 times that amount.(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must measure 6.54 cm to 6.86 cm in diameter, for a total volume of 10.650 tablespoons. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about three times as big as a Baseball
In other words, 40 tablespoons is 2.8115121310 times the size of a Baseball, and the size of a Baseball is 0.35568048560 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 13.642831590 tablespoons and 14.811607260 tablespoons. A major league pitcher can throw a baseball at up to 150 kph (91 mph) in a fastball pitch.
It's about one-and-four-fifths times as big as a Baseball (packed)
In other words, 40 tablespoons is 1.79936780 times the size of a Baseball (packed), and the size of a Baseball (packed) is 0.555750750 times that amount.(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 13.6428320 tablespoons and 14.8116070 tablespoons. A major league pitcher can throw a fastball at up to 150 kph (91 mph).
It's about as big as a Blood Donation
It's about as big as a STARBUCKS Venti Coffee
A STARBUCKS Venti coffee drink measures 40 tablespoons. The name of the size, Venti, is the Italian word for twenty.
It's about one-third as big as an Ostrich Egg
In other words, 40 tablespoons is 0.36240 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 2.7590 times that amount.(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 108.20 tablespoons in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.