From G. Bahto's GCA interview:
2. Please briefly describe the matched set of par-3 holes the pair typically designed into their courses.
In the order of their length, we will start with the so-called 'Short', a fairly generic par-3 common to many courses in the British Isles long before Macdonald began his quest for the better holes in Europe. The 'Short' specifically tests the skills of the short-iron game. Macdonald always felt there was room for improvement in a golf hole, so he (and later Raynor) surrounded his versions of this genre' with a sea of sand - elevating the green to make the target more dramatic and intimidating. These Shorts were nearly always drawn as a squarish looking green with a larger surrounding enclosure indicating sand bunkering. The bunkering details would then be developed during the construction phase. Short hole putting surfaces were generally much wider than deep, containing strong undulations befitting a shorter hole. A horseshoe feature with the open end facing the tee or a rounded dished depression were mainstays of design. Two of their finest examples can be found at the wild 6th at National and 10th at Chicago Golf Club (where two depressions are separated by a ridge). The origin of the Macdonald/Raynor Short was the 5th at Brancaster. He favored this particular version over the 8th at St. Andrews because the tee-box was higher and afforded a clearer view of the green. Shorts were generally constructed 135 to 145 yards long but often clubs incorrectly added back tees in a pointless effort to gain yardage on the scorecard.
Next longest would be the 'Eden' hole, fashioned after the 11th at St. Andrews (A.K.A. High Hole-In), whose severely sloping back-to- front putting surface remains one of the most fearsome in golf. Original Macdonald/Raynor/Banks versions usually present teardrop shaped greens, falling in a yardage range between 160 to 175 yards. Aesthetically, their Eden holes have some of the most picturesque greenside bunkering on the course. Pinched in front by a representation of 'Strath's' pot bunker on the right and 'Hill' bunker on the left, Macdonald always installed an 'Eden' bunker behind the green representing the shoreline of the Eden River behind St. Andrews' 11th green. Strath's bunker, of course, is named for the great Davie Strath and his many unsuccessful bouts with this pit. Greenside left we find Hill bunker, so called because its cape creates a downhill slope in the putting surface. Most renditions include a 'Shelley' (or 'Cockleshell') bunker short right of the green. There are so many fine Eden holes that its difficult to identify the best one. However, there is a strong consensus that the 11th at Fishers Island, framed by Long Island Sound in the background, may be as good as it gets. Macdonald felt there should be an intimidating hazard fronting the Eden hole because at the turn of the century golfers sometimes played short of the hole (even using putters) and chipped on to avoid disaster. In addition, a topped ball was not punished. At the National Golf Links, Macdonald placed the 13th Eden green on the far side of a stretch of water to combat this.