{
 "about": "The record of this Plate: the facts it is drawn from, kept inside the work. Plain JSON; the artwork does not read it. CC0 1.0, no rights reserved.",
 "work": {"title": "Birds Head", "series": "Plates", "artist": "Kenny Lienhard", "year": 2026, "plate": "26 of 52", "palette": "malachite"},
 "plate": {"name": "Birds Head", "code": "BH", "model": "PB2002 (Bird 2003)", "class": "micro", "area_km2": 525655, "centroid_lat_lon": [-1.242, 131.986], "ocean_share": 0.7179, "land_share": 0.2821},
 "motion": {"frame": "no-net-rotation", "euler_pole_lat_lon": [-41.5661, 97.7674], "rotation_deg_per_million_years": 0.77423, "speed_mm_per_year_at_centroid": 66.65, "heading_deg_at_centroid": 302.9, "speed_range_mm_per_year": [63.92, 70.44], "the_artwork_drifts": "-66.65 mm a year along its cut, one frame of rock every 13663 years"},
 "cover": {"slope and ridge": 0.4549, "rainforest": 0.2648, "shelf sea": 0.2043, "deep ocean": 0.0587, "forest": 0.0048, "cropland": 0.0044, "grassland": 0.0041, "lakes and rivers": 0.0037, "towns": 0.0003},
 "palette_from": ["jungle", "ocean", "shallow sea"],
 "era": {"name": "Sahul’s edge", "what": "Low seas, the shelf around the Bird’s Head dry land", "arrives_years_before_2026": [30100, 30000], "leaves_years_before_2026": [15426, 7256], "account": "The past. With the sea about 120 metres lower, about a fifth of this plate’s sea, more than 80,000 square kilometres, was dry land. Misool, Salawati and Yapen were joined to New Guinea, Bintuni Bay and the Berau Gulf were plains, and the Bird’s Head was the northwest corner of Sahul, facing Halmahera across deep water. Waigeo and Batanta may have stayed an island. The land was already dry when the timeline begins; the rising sea drowned most of it between 15,426 and 7,256 years ago. The lines that stand for the sea turn to the colour of land, all at once, and only across those spans.", "source": "Lambeck et al. 2014, PNAS 111:15296; Günther et al. 2015, Zoosystematics and Evolution 91:199; Diamond and Bishop 2020, Bulletin of the British Ornithologists’ Club 140:423"},
 "history": [{"years_ago": 15000000, "range_years_ago": [17000000, 7000000], "what": "Subduction began beneath the Halmahera arc on this plate's western edge; the date is debated.", "source": "Crameri et al. 2020, Nature Communications 11:3750, doi:10.1038/s41467-020-17522-9 (SZI Database entries)"}],
 "outline_lon_lat": [[[130.55, 0.47], [129.99, 0.68], [129.2, 1.06], [128.75, 1.62], [128.19, 1.97], [128.08, 2.29], [126.87, 2.35], [126.43, 1.71], [126.14, 1.0], [125.97, 0.19], [125.97, -0.28], [127.24, -1.39], [127.67, -1.76], [128.38, -2.29], [129.26, -2.42], [130.11, -2.52], [131.06, -2.87], [131.91, -3.43], [132.72, -4.44], [133.31, -4.63], [133.91, -4.81], [134.49, -4.44], [134.97, -4.3], [135.26, -3.85], [135.77, -3.4], [136.17, -3.1], [136.56, -2.8], [136.93, -2.49], [137.28, -2.3], [137.63, -2.08], [138.0, -1.9], [138.49, -1.75], [138.97, -1.61], [138.79, -1.16], [138.67, -0.82], [138.05, -0.72], [137.44, -0.62], [136.45, -0.23], [135.66, -0.02], [134.94, 0.42], [134.47, 0.26], [133.33, -0.15], [132.82, -0.04], [132.51, 0.02], [132.37, 0.03], [131.1, 0.27], [130.55, 0.47]]],
 "sources": ["Plate outlines and motion: Bird, P. (2003). An updated digital model of plate boundaries. Geochemistry, Geophysics, Geosystems 4(3), 1027, doi:10.1029/2001GC000252. No-net-rotation frame computed from PB2002 alone.", "What covers each plate: ESA CCI Land Cover and Water Bodies, NOAA ETOPO 2022, Koppen-Geiger climate maps, NSIDC Sea Ice Index, on a 1 arc-minute grid."],
 "engine_sha256": "a7fbc03acc0fc9ba343881bb88ddaf2b7564564d8bc9cbed16e75e47e01fb3f2"
}