Related by context. Frequent words. (Click for all words.) 55 concentric circles 55 concentric rings 52 rectangle 50 ellipse 49 rectangular 48 pentagons 47 rectangular shaped 47 concentric 47 convex 45 quadrilateral 45 torus 45 outer 45 trapezoid 45 latitudinal 45 triangle 45 whorl 44 haloes 44 hexagonal 44 pyramidal 44 gridded 44 U shaped 44 triangles 44 rectangles 43 hexagons 43 lowermost 43 radially 43 whorls 43 hexagon 43 ink blot 43 latticed 43 #x#x# [005] 43 geometric pattern 43 semicircular 43 geodesic 43 ovoid 43 toroidal 42 quadrants 42 motif 42 pictogram 42 outer rim 42 infinity 42 donut shaped 42 abstract shapes 42 concave 42 parallelogram 42 Fig. 1A 42 directional arrows 42 Venn diagram 42 stippled 42 oblong 42 silicon atoms 42 Vertically 42 pentagonal 42 evenly spaced 41 teardrop shaped 41 anticlockwise 41 boomerang shaped 41 triangle shaped 41 Superimposed 41 macrocosm 41 apse 41 gently curved 41 undulated 41 lattice 41 vertically stacked 41 vitrine 41 spiderweb 41 vortex 41 geometrical shapes 41 horizontal stripes 41 diametre 41 leftmost 41 lattices 40 rectilinear 40 cruciform 40 stalactite 40 spherical 40 cuboid 40 horizontal 40 circumference 40 perfectly symmetrical 40 inverted pyramid 40 outwards 40 anisotropic 40 zigzag pattern 40 hypotenuse 40 symmetrically 40 vertices 40 hemispherical 40 spatial dimensions 40 pediments 40 radiating 40 sawtooth 40 π 40 dots 40 perpendicularly 40 pilasters 39 encircles 39 laser etched 39 curvilinear 39 Fig.