To do dips at home, find two chairs of equal height and rest your arms and body weight on the seats. (nourishtheplanet.com)
For rectangular covers, you can make the top piece square after unlocking the aspect ratio in the Size options and then making the width equal the height.) (chrismcmullen.com)
As Darwin later confessed: «I never dreamed that islands, about fifty or sixty miles apart, and most of them in sight of each other, formed of precisely the same rocks, placed under a quite similar climate, rising to a nearly equal height, would have been differently tenanted.» (scientificamerican.com)