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(A) examples of bilaterally symmetrical flowers with similar shape (left: Galeopsis speciosa, right: Lamium maculatum)---only the en face photographs; (B) colored flower stimulus and its sepia tone version (Gagea lutea); (C) example of a rating question setting (Geranium palustre); (D) Flowers with different angularity levels. Left: round (Fragaria viridis), center: mixed (Erigeron annuus), right: sharp (Borago officinalis).
