Curl figure is relatively common and it is related to a wavy fiber pattern, either from side to side of the surface, or in and out of it. Below some examples.
Maple, European (from Seralvo)- PZC = 14.2Pear (from [Source 4])- PZC = 9.1Purpleheart (from [Source 20])- PZC = 11.1Walnut, European (from Seralvo)- PZC = 13.9Aniegre (from Evolution Panels and Doors)- PZC = 14.9Movingui (from [Source 28])- PZC = 15.9E. Nitens (from John Fairweather)- PZC = 16.9Maple, Hard (from [Source 4])- PZC = 13.9Etimoe (from P. Hinds)- PZC = 18.5Aniegre (from P. Hinds)- PZC = 12.0Ash, American White (from P. Hinds)- PZC = 10.4Olive (from [Source 25])- PZC = 6.0Ash, Olive (from Evolution Panels and Doors)- PZC = 13.1Koa (from anonimous supporter from Hawaii)- PZC = 26.4Limba, Black (from [Source 28])- PZC = 21.9Maple, European (from P. Hinds)- PZC = 12.8Paldao (from P. Hinds)- PZC = 18.4Cypress, Mediterranean (from [Source 24])- PZC = 8.5Canarywood (from NEHOSOC)- PZC = 18.6Willow (from [Source 4])- PZC = 17.4Tasmanian Myrtle (from Australian Premier Veneer)- PZC = 13.0Australian Blackwood (from Australian Premier Veneer)- PZC = 26.9Massaranduba (from [Source 29])- PZC = 10.8A. Implexa (from [Source 58])- PZC = 15.3Australian Blackwood (from Boutique Timber)- PZC = 23.4Eucalyptus (Tasmanian Oak) (from Australian Premier Veneer)- PZC = 14.0J. Scopulorum (from [Source 53])- PZC = 10.2Mango (from C. McGuire)- PZC = 11.2Chestnut, Sweet (from [Source 71])- PZC = 14.6Walnut, Black (from [Source 56])- PZC = 18.5Cedar, Australian Red (from J. McConnachie)- PZC = 27.6Maple, Queensland (from J. McConnachie)- PZC = 14.1Narra (from Elia Pace)- PZC = 10.1Tasmanian Musk (from Australian Premier Veneer)- PZC = 10.5Pear, Bradford (from 2feathers Creative Making)- PZC = 6.8A. Dealbata (from D. Valentini)- PZC = 19.1