Tall is not a measurement
A coast redwood on this board is Hyperion, the tallest known living tree, rounded. That sentence is doing a lot of work. It is not every redwood. It is not a tree in a park you walked through. Players who answer from a park tree will be short, and the red outline will show the difference between a visit and a record specimen. The fact told you which tree. Read it after you miss, and decide whether you want to remember Hyperion or 'a redwood' as two different units.
Other plants on the shelf are ordinary by comparison and still miss, because ordinary plants are remembered as 'about my height' or 'bigger than the house' without a pause to pick which. Your height is a real unit if you know it. A house is a mood. Replace the house with a door or a hoop at 3.05 metres before you scale up to a tree. A tree that is 'bigger than a house' might be three hoops or thirty. Those scores are not neighbors.
The axis is almost always height
Plants tempt a width answer. The canopy is the picture. The question is often the height. A wide oak and a narrow redwood are not the same silhouette on this board, and the grip tells you which way the guess grows. If you resize the width of a canopy when the heading says tall, you will get a confident wrong shape. Zoom out so you can see the whole height against the reference, not a leaf.
The reference on a category day is another plant. You do not get a bus unless you are on mixed. That is harder, and it is the drill. Two moods of 'tall' cancel. A spoken ratio remains. About twice the smaller tree. A little over. Within 6 percent is 100 points and, on a first encounter with Hyperion, unlikely. A ratio of two is 45 and respectable if you said two. A shrug is not a ratio.
Versions and living things
Living measurements move. A tree grows, a record is revised, a typical specimen is not the champion. The library picks one rounded figure and the fact names it. We are not tracking a forest in real time. If a published height for the named specimen moves enough to change an eye's ratio, that is a correction for the contact page, with a source. A photograph of a different tree is not that source.
Do not use the board to decide whether a tree near a house is safe. The silhouette is not an arborist's report. It is a comparison of two published figures. The terms page says the same thing more formally. Play the ratio. Hire a person before you cut a limb.
Practice
Unlimited plant pairs are slow in a useful way. There is less fame than on the landmarks shelf and less textbook crop than in space. The error is vagueness. Force a number of times. Twice. Four times. Ten times a hoop, if you are borrowing a unit from sport. Then lock in. The red edge will tell you if 'four' was 'eight.' Adjust the word you use, not just the slider. The word is what you will have tomorrow when the slider is in a different place.
A plant five on the daily shelf still uses weights one, one, two, three, and three. The last rounds are the ones to spend on a specimen you have already seen in unlimited. Do not open the answers first. The surprise is the only reason the round is a test. A memorised Hyperion height is a trivia card. A Hyperion you can place against another tree is a unit.
Take one unit away
Leave the shelf with one height you can see: either a human-scale plant you trust, or Hyperion as a named champion, not both blurred into 'trees are tall.' The mixed board will eventually put a plant next to a building. The building has a version sentence too. The plant has one. The ratio between those sentences is the whole round. Fame and foliage are not in the formula.
Within 6 percent scores 100. Five times off scores 0. Most plant misses live between those, in the language of double and triple. That is good news. It means the eye is in range and the vocabulary is lazy. Fix the vocabulary. The red outline will get closer without you memorising a forest. A useful note after a plant round is only the multiple you will reuse: twice a door, four hoops, half of Hyperion. Leave the mood words on the cutting-room floor. They are what made the white silhouette confident and wrong.